Nucleic acids encoding antibodies against human CSF-1R

ABSTRACT

The present invention relates to antibodies against human CSF-1R (CSF-1R antibody), methods for their production, pharmaceutical compositions containing said antibodies, and uses thereof.

CROSS REFERENCES TO RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No. 13/582,989filed on Mar. 3, 2011, which is a National Phase application under 35U.S.C. §371 of International Application No. PCT/EP2011/053213, filed onMar. 3, 2011, which claims the benefit of EP Patent Application No.10002269.8, filed on Mar. 5, 2010, the entire disclosures of which areexpressly incorporated by reference herein.

SUBMISSION OF SEQUENCE LISTING ON ASCII TEXT FILE

The content of the following submission on ASCII text file isincorporated herein by reference in its entirety: a computer readableform (CRF) of the Sequence Listing (file name: 146392029810.TXT, daterecorded: Oct. 28, 2015, size: 36 KB).

FIELD OF THE INVENTION

The present invention relates to antibodies against human CSF-1R (CSF-1Rantibody), methods for their production, pharmaceutical compositionscontaining said antibodies, and uses thereof.

BACKGROUND OF THE INVENTION

The CSF-1 receptor (CSF-1R; synonyms: M-CSF receptor; Macrophagecolony-stimulating factor 1 receptor, EC 2.7.10.1, Fms proto-oncogene,c-fms, Swiss Prot P07333, CD115) is known since 1986 (Coussens L., etal., Nature 320 (1986) 277-280). CSF-1R is a growth factor and encodedby the c-fms proto-oncogene (reviewed e.g. in Roth, P. and Stanley, E.R., Curr. Top. Microbiol. Immunol. 181 (1992) 141-67).

CSF-1R is the receptor for M-CSF (macrophage colony stimulating factor,also called CSF-1) and mediates the biological effects of this cytokine(Sherr, C. J., et al., Cell 41 (1985) 665-676). The cloning of thecolony stimulating factor-1 receptor (also called c-fms) was describedfor the first time in Roussel, M. F., et al., Nature 325 (1987) 549-552.In that publication, it was shown that CSF-1R had transforming potentialdependent on changes in the C-terminal tail of the protein including theloss of the inhibitory tyrosine 969 phosphorylation which binds Cbl andthereby regulates receptor down regulation (Lee, P. S., et al., Embo J.18 (1999) 3616-3628).

CSF-1R is a single chain, transmembrane receptor tyrosine kinase (RTK)and a member of the family of immunoglobulin (Ig) motif containing RTKscharacterized by repeated Ig domains in the extracellular portion of thereceptor. The intracellular protein tyrosine kinase domain isinterrupted by a unique insert domain that is also present in the otherrelated RTK class III family members that include the platelet derivedgrowth factor receptors (PDGFR), stem cell growth factor receptor(c-Kit) and fins-like cytokine receptor (FLT3). In spite of thestructural homology among this family of growth factor receptors, theyhave distinct tissue-specific functions. CSF-1R is mainly expressed oncells of the monocytic lineage and in the female reproductive tract andplacenta. In addition expression of CSF-1R has been reported inLangerhans cells in skin, a subset of smooth muscle cells (Inaba, T., etal., J. Biol. Chem. 267 (1992) 5693-5699), B cells (Baker, A. H., etal., Oncogene 8 (1993) 371-378) and microglia (Sawada, M., et al., BrainRes. 509 (1990) 119-124).

The main biological effects of CSF-1R signaling are the differentiation,proliferation, migration, and survival of hematopoietic precursor cellsto the macrophage lineage (including osteoclast). Activation of CSF-1Ris mediated by its ligand, M-CSF. Binding of M-CSF to CSF-1R induces theformation of homodimers and activation of the kinase by tyrosinephosphorylation (Stanley, E. R., et al., Mol. Reprod. Dev. 46 (1997)4-10). Further signaling is mediated by the p85 subunit of PI3K and Grb2connecting to the PI3K/AKT and Ras/MAPK pathways, respectively. Thesetwo important signaling pathways can regulate proliferation, survivaland apoptosis. Other signaling molecules that bind the phosphorylatedintracellular domain of CSF-1R include STAT1, STAT3, PLCy, and Cbl(Bourette, R. P. and Rohrschneider, L. R., Growth Factors 17 (2000)155-166).

CSF-1R signaling has a physiological role in immune responses, in boneremodeling and in the reproductive system. The knockout animals foreither M-CSF-1 (Pollard, J. W., Mol. Reprod. Dev. 46 (1997) 54-61) orCSF-1R (Dai, X. M., et al., Blood 99 (2002) 111-120) have been shown tohave osteopetrotic, hematopoietic, tissue macrophage, and reproductivephenotypes consistent with a role for CSF-1R in the respective celltypes.

Sherr, C. J. et al., Blood 73 (1989) 1786-1793 describes relates to someantibodies against CSF-1R that inhibit the CSF-1 activity (see Sherr, C.J. et al., Blood 73 (1989) 1786-1793). Ashum, R. A., et al., Blood 73(1989) 827-837 relates to CSF-1R antibodies. Lenda, D. M., et al.,Journal of immunology 170 (2003) 3254-3262 relates to reduced macrophagerecruitment, proliferation, and activation in CSF-1-deficient miceresults in decreased tubular apoptosis during renal inflammation.Kitaura, H., et al., Journal of dental research 87 (2008) 396-400 refersto an anti-CSF-1 antibody which inhibits orthodontic tooth movement. WO2001/030381 mentions CSF-1 activity inhibitors including antisensenucleotides and antibodies while disclosing only CSF-1 antisensenucleotides. WO 2004/045532 relates to metastases and bone lossprevention and treatment of metastatic cancer by a M-CSF antagonistdisclosing as antagonist anti-CSF-1-antibodies only.

WO 2005/046657 relates to the treatment of inflammatory bowel disease byanti-CSF-1-antibodies. US 2002/0141994 relates to inhibitors of colonystimulating factors. WO 2006/096489 relates to the treatment ofrheumatoid arthritis by anti-CSF-1-antibodies.

WO 2009/026303 and WO 2009/112245 relate to anti-CSF-1R antibodies.

SUMMARY OF THE INVENTION

-   The invention comprises an antibody binding to human CSF-1R,    characterized in binding to same epitope as the deposited antibody    DSM ACC2921.-   In one embodiment the antibody is characterized in comprising as    heavy chain variable domain CDR3 region a CDR3 region of SEQ ID NO:    1.

In one embodiment the antibody is characterized in that

-   a) the heavy chain variable domain comprises a CDR3 region of SEQ ID    NO: 1, a CDR2 region of SEQ ID NO: 2, and a CDR1 region of SEQ ID    NO:3, and the light chain variable domain comprises a CDR3 region of    SEQ ID NO: 4, a CDR2 region of SEQ ID NO:5, and a CDR1 region of SEQ    ID NO:6; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).

In one embodiment the antibody is characterized in comprising

-   a) the amino acid sequence of the heavy chain variable domain is SEQ    ID NO: 7, and the amino acid sequence of the light chain variable    domain is SEQ ID NO:8; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).

In one embodiment the antibody binding to human CSF-1R and beingcharacterized by the above mentioned amino acid sequences and amino acidsequence fragments is of human IgG1 subclass or is of human IgG4subclass.

A further embodiment of the invention is a pharmaceutical compositioncomprising an antibody according to the invention.

-   The invention further comprises a pharmaceutical composition    characterized in comprising the antibody binding to human CSF-1R    being characterized by the the above mentioned epitope binding    properties or alternatively by the above mentioned amino acid    sequences and amino acid sequence fragments.-   The invention further comprises the use an of an antibody    characterized characterized in comprising the antibody binding to    human CSF-1R being characterized by the the above mentioned epitope    binding properties or alternatively by the above mentioned amino    acid sequences and amino acid sequence fragments for the manufacture    of a pharmaceutical composition.-   The invention further comprises the use of an antibody characterized    in comprising the antibody binding to human CSF-1R being    characterized by the the above mentioned epitope binding properties    or alternatively by the above mentioned amino acid sequences and    amino acid sequence fragments for the treatment of a CSF-1R mediated    diseases.-   The invention further comprises the use of an antibody characterized    in comprising the antibody binding to human CSF-1R being    characterized by the the above mentioned epitope binding properties    or alternatively by the above mentioned amino acid sequences and    amino acid sequence fragments for the treatment of cancer.-   The invention further comprises the use of an antibody characterized    in comprising the antibody binding to human CSF-1R being    characterized by the the above mentioned epitope binding properties    or alternatively by the above mentioned amino acid sequences and    amino acid sequence fragments for the treatment of bone loss.-   The invention further comprises the of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the the above mentioned epitope binding properties or    alternatively by the above mentioned amino acid sequences and amino    acid sequence fragments for the prevention or treatment of    metastasis.-   The invention further comprises the of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the the above mentioned epitope binding properties or    alternatively by the above mentioned amino acid sequences and amino    acid sequence fragments for treatment of inflammatory diseases.-   One aspect of the invention is an antibody binding to human CSF-1R,    characterized in comprising as heavy chain variable domain CDR3    region a CDR3 region of SEQ ID NO: 1.-   Another aspect of the invention is an antibody binding to human    CSF-1R, characterized in that-   a) the heavy chain variable domain comprises a CDR3 region of SEQ ID    NO: 1, a CDR2 region of SEQ ID NO: 2, and a CDR1 region of SEQ ID    NO:3, and the light chain variable domain comprises a CDR3 region of    SEQ ID NO: 4, a CDR2 region of SEQ ID NO:5, and a CDR1 region of SEQ    ID NO:6; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).

In one embodiment the antibody is characterized in comprising

-   a) the amino acid sequence of the heavy chain variable domain is SEQ    ID NO: 7, and the amino acid sequence of the light chain variable    domain is SEQ ID NO:8; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).

In one aspect of the invention the antibodies according to the inventionbind to human CSF-1R with an affinity of at least 10⁻⁸ mol/l to 10⁻¹²mol/l.

In one aspect of the invention the antibodies according to the inventionis a humanized antibody.

A further embodiment of the invention is a nucleic acid encoding a heavychain variable domain and/or a light chain variable domain of anantibody according to the invention. Preferably the nucleic acid encodesa heavy chain of an antibody binding to human CSF-1R, characterized incomprising as heavy chain CDR3 region a CDR3 region of SEQ ID NO: 1.

-   A further embodiment of the invention is a nucleic acid encoding an    antibody according to the invention characterized in that-   a) the heavy chain variable domain comprises a CDR3 region of SEQ ID    NO: 1, a CDR2 region of SEQ ID NO: 2, and a CDR1 region of SEQ ID    NO:3, and the light chain variable domain comprises a CDR3 region of    SEQ ID NO: 4, a CDR2 region of SEQ ID NO:5, and a CDR1 region of SEQ    ID NO:6; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).

The invention further provides expression vectors containing nucleicacid according to the invention capable of expressing said nucleic acidin a prokaryotic or eukaryotic host cell, and host cells containing suchvectors for the recombinant production of such an antibody.

The invention further comprises a prokaryotic or eukaryotic host cellcomprising a vector according to the invention.

The invention further comprises a method for the production of arecombinant humanized antibody according to the invention, characterizedby expressing a nucleic acid according to the invention in a prokaryoticor eukaryotic host cell and recovering said antibody from said cell orthe cell culture supernatant. The invention further comprises theantibody obtainable by such a recombinant method.

Antibodies according to the invention show benefits for patients in needof a CSF-1R targeting therapy. The antibodies according to the inventionhave new and inventive properties causing a benefit for a patientsuffering from a tumor disease, especially suffering from cancer.

The invention further provides a method for treating a patient sufferingfrom cancer, comprising administering to a patient diagnosed as havingsuch a disease (and therefore being in need of such a therapy) aneffective amount of an antibody binding to human CSF-1R according to theinvention. The antibody is administered preferably in a pharmaceuticalcomposition.

A further embodiment of the invention is a method for the treatment of apatient suffering from cancer characterized by administering to thepatient an antibody according to the invention.

The invention further comprises the use of an antibody according to theinvention for the treatment of a patient suffering from cancer and forthe manufacture of a pharmaceutical composition according to theinvention. In addition, the invention comprises a method for themanufacture of a pharmaceutical composition according to the invention.

The invention further comprises a pharmaceutical composition comprisingan antibody according to the invention, optionally together with abuffer and/or an adjuvant useful for the formulation of antibodies forpharmaceutical purposes.

The invention further provides pharmaceutical compositions comprising anantibody according to the invention in a pharmaceutically acceptablecarrier. In one embodiment, the pharmaceutical composition may beincluded in an article of manufacture or kit.

DESCRIPTION OF THE FIGURES

FIG. 1 Growth inhibition of BeWo tumor cells in 3D culture undertreatment with different anti-CSF-1R monoclonal antibodies at aconcentration of 10 μg/ml.

-   -   X axis: viability mean relative light units (RLU) corresponding        to the ATP-content of the cells (CELLTITER-GLO® assay).    -   Y axis: tested probes: Minimal Medium (0.5% FBS), mouse IgG1        (mIgG1, 10 μg/ml), mouse IgG2a (mIgG2a 10 μg/ml), CSF-1 only,        <CSF-1R>7G5.3B6, and SC-02, clone 2-4A5.    -   Highest inhibition of CSF-1 induced growth was observed with the        anti-CSF-1R antibodies according to the invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION I. Definitions

The term “antibody” encompasses the various forms of antibodiesincluding but not being limited to whole antibodies, antibody fragments,humanized antibodies, chimeric antibodies, T cell epitope depletedantibodies, and further genetically engineered antibodies as long as thecharacteristic properties according to the invention are retained.

“Antibody fragments” comprise a portion of a full length antibody,preferably the variable domain thereof, or at least the antigen bindingsite thereof. Examples of antibody fragments include diabodies,single-chain antibody molecules, and multispecific antibodies formedfrom antibody fragments. scFv antibodies are, e.g., described in Huston,J. S., Methods in Enzymol. 203 (1991) 46-88). In addition, antibodyfragments comprise single chain polypeptides having the characteristicsof a V_(H) domain binding to CSF-1R, namely being able to assembletogether with a V_(L) domain, or of a V_(L) domain binding to CSF-1R,namely being able to assemble together with a V_(H) domain to afunctional antigen binding site and thereby providing the property.

The terms “monoclonal antibody” or “monoclonal antibody composition” asused herein refer to a preparation of antibody molecules of a singleamino acid composition.

The term “chimeric antibody” refers to a monoclonal antibody comprisinga variable region, i.e., binding region, from mouse and at least aportion of a constant region derived from a different source or species,usually prepared by recombinant DNA techniques. Chimeric antibodiescomprising a mouse variable region and a human constant region areespecially preferred. Such rat/human chimeric antibodies are the productof expressed immunoglobulin genes comprising DNA segments encoding ratimmunoglobulin variable regions and DNA segments encoding humanimmunoglobulin constant regions. Other forms of “chimeric antibodies”encompassed by the present invention are those in which the class orsubclass has been modified or changed from that of the originalantibody. Such “chimeric” antibodies are also referred to as“class-switched antibodies.” Methods for producing chimeric antibodiesinvolve conventional recombinant DNA and gene transfection techniquesnow well known in the art. See, e.g., Morrison, S. L., et al., Proc.Natl. Acad Sci. USA 81 (1984) 6851-6855; U.S. Pat. No. 5,202,238 andU.S. Pat. No. 5,204,244.

The term “CDR-grafted variant” as used within the current applicationdenotes a variable domain of an antibody comprising complementarydetermining regions (CDRs or hypervariable regions) from one source orspecies and framework regions (FRs) from a different source or species,usually prepared by recombinant DNA techniques. CDR-grafted variants ofvariable domains comprising murine CDRs and a human FRs are preferred.

The term “T-cell epitope depleted variant” as used within the currentapplication denotes a variable domain of an antibody which was modifiedto remove or reduce immunogenicity by removing human T-cell epitopes(peptide sequences within the variable domains with the capacity to bindto MHC Class II molecules). By this method interactions between aminoacid side chains of the variable domain and specific binding pocketswith the MHC class II binding groove are identified. The identifiedimmunogenic regions are mutated to eliminate immunogenicity. Suchmethods are described in general in, e.g., WO 98/52976.

The term “humanized variant” as used within the current applicationdenotes a variable domain of an antibody, which is reconstituted fromthe complementarity determining regions (CDRs) of non-human origin, e.g.from a non-human species, and from the framework regions (FRs) of humanorigin, and which has been further modified in order to alsoreconstitute or improve the binding affinity and specificity of theoriginal non-human variable domain. Such humanized variants are usuallyprepared by recombinant DNA techniques. The reconstitution of theaffinity and specificity of the parent non-human variable domain is thecritical step, for which different methods are currently used. In onemethod it is determined whether it is beneficial to introduce mutations,so called backmutations, in the non-human CDRs as well as in the humanFRs. The suited positions for such backmutations can be identified e.g.by sequence or homology analysis, by choosing the human framework (fixedframeworks approach; homology matching or best-fit), by using consensussequences, by selecting FRs from several different human mAbs, or byreplacing non-human residues on the three dimensional surface with themost common residues found in human mAbs (“resurfacing” or “veneering”).

The antibodies according to the invention include, in addition, suchantibodies having “conservative sequence modifications”, nucleotide andamino acid sequence modifications which do not affect or alter theabove-mentioned characteristics of the antibody according to theinvention. Modifications can be introduced by standard techniques knownin the art, such as site-directed mutagenesis and PCR-mediatedmutagenesis. Conservative amino acid substitutions include ones in whichthe amino acid residue is replaced with an amino acid residue having asimilar side chain. Families of amino acid residues having similar sidechains have been defined in the art. These families include amino acidswith basic side chains (e.g., lysine, arginine, histidine), acidic sidechains (e.g., aspartic acid, glutamic acid), uncharged polar side chains(e.g. glycine, asparagine, glutamine, serine, threonine, tyrosine,cysteine, tryptophan), nonpolar side chains (e.g., alanine, valine,leucine, isoleucine, proline, phenylalanine, methionine), beta-branchedside chains (e.g., threonine, valine, isoleucine) and aromatic sidechains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Thus, apredicted nonessential amino acid residue in a human anti-CSF-1Rantibody can be preferably replaced with another amino acid residue fromthe same side chain family.

Amino acid substitutions can be performed by mutagenesis based uponmolecular modeling as described by Riechmann, L., et al., Nature 332(1988) 323-327 and Queen, C., et al., Proc. Natl. Acad. Sci. USA 86(1989) 10029-10033.

The term “CSF-1R” as used herein referrers to human CSF-1R (SEQ ID No:15) CSF-1R (synonyms: CSF-1 receptor M-CSF receptor; Macrophagecolony-stimulating factor 1 receptor, EC 2.7.10.1, Fms proto-oncogene,c-fms, Swiss Prot P07333, CD115,) is known since 1986 (Coussens L., etal., Nature 320 (1986) 277-280). CSF-1R is a growth factor and encodedby the c-fms proto-oncogene (reviewed e.g. in Roth, P. and Stanley, E.R., Curr. Top. Microbiol. Immunol. 181 (1992) 141-67).

CSF-1R is the receptor for M-CSF (macrophage colony stimulating factor,also called CSF-1) and mediates the biological effects of this cytokine(Sherr, C. J., et al., Cell 41 (1985) 665-676). The cloning of thecolony stimulating factor-1 receptor (also called c-fms) was describedfor the first time in Roussel, M., F., et al., Nature 325 (1987)549-552. In that publication, it was shown that CSF-1R had transformingpotential dependent on changes in the C-terminal tail of the proteinincluding the loss of the inhibitory tyrosine 969 phosphorylation whichbinds Cbl and thereby regulates receptor down regulation (Lee, P. S., etal., Embo J. 18 (1999) 3616-3628).

CSF-1R is a single chain, transmembrane receptor tyrosine kinase (RTK)and a member of the family of immunoglobulin (Ig) motif containing RTKscharacterized by repeated Ig domains in the extracellular portion of thereceptor. The intracellular protein tyrosine kinase domain isinterrupted by a unique insert domain that is also present in the otherrelated RTK class III family members that include the platelet derivedgrowth factor receptors (PDGFR), stem cell growth factor receptor(c-Kit) and fins-like cytokine receptor (FLT3). In spite of thestructural homology among this family of growth factor receptors, theyhave distinct tissue-specific functions. CSF-1R is mainly expressed oncells of the monocytic lineage and in the female reproductive tract andplacenta. In addition expression of CSF-1R has been reported inLangerhans cells in skin, a subset of smooth muscle cells (Inaba, T., etal., J. Biol. Chem. 267 (1992) 5693-5699), B cells (Baker, A. H., etal., Oncogene 8 (1993) 371-378) and microglia (Sawada, M., et al., BrainRes. 509 (1990) 119-124).

As used herein, the terms “binding to human CSF-1R” or “that binds tohuman CSF-1R” or anti-CSF-1R″ are used interchangeable and refer to anantibody specifically binding to the human CSF-1R antigen. The bindingaffinity is of KD-value of 1.0×10⁻⁸ mol/1 or lower at 35° C., preferablyof a KD-value of 1.0×10⁻⁹ mol/1 or lower at 35° C. The binding affinityis determined with a standard binding assay, such as surface plasmonresonance technique (BIACORE®) (see Example 4).

The term “epitope” denotes a protein determinant capable of specificallybinding to an antibody. Epitopes usually consist of chemically activesurface groupings of molecules such as amino acids or sugar side chainsand usually epitopes have specific three dimensional structuralcharacteristics, as well as specific charge characteristics.Conformational and nonconformational epitopes are distinguished in thatthe binding to the former but not the latter is lost in the presence ofdenaturing solvents. Preferably an antibody according to the inventionbinds specifically to native but not to denatured CSF-1R.

The term “binding to the same epitope as the deposited antibody DSMACC2921” as used herein refers to an anti-CSF-1R antibody of theinvention that binds to the same epitope on CSF-1R to which the antibody<CSF-1R>7G5.3B6 (deposit no. DSM ACC2921) binds. The epitope bindingproperty of an anti-CSF-1R antibody of the present invention may bedetermined using techniques known in the art. The CSF-1R antibody ismeasured at 25° C. by Surface Plasmon Resonance (SPR) in an in vitrocompetitive binding inhibition assay to determine the ability of thetest antibody to inhibit binding of antibody <CSF-1R>7G5.3B6 (depositno. DSM ACC2921) to CSF-1R. This can be investigated by a BIAcore assay(Pharmacia Biosensor AB, Uppsala, Sweden) as e.g. in Example 5. InExample 5 the percentage (%) of expected binding response of the CSF-1Rantibody of the invention competing with the bound the antibody<CSF-1R>7G5.3B6 (deposit no. DSM ACC2921) is calculated by“100*relativeResponse(general_stability_early)/rMax”, where rMax iscalculated by “relativeResponse(general_stability_late)*antibodymolecular weight/antigen molecular weight” as described in BIAcore assayepitope mapping instructions. A minimal binding response is alsocalculated from the pairs of identical antibody 1 and 2 (see Example 5).Thereof the obtained maximal value+100%, preferably 50%, is set asthreshold for significant completion and thus significant binding to thesame epitope (see Example 5 for antibody <CSF-1R>7G5.3B6 calculatedthreshold is 3+3=6, preferably 3+1.5=4.5). Thus an antibody binding tohuman CSF-1R, characterized in “binding to the same epitope as<CSF-1R>7G5.3B6 (deposit no. DSM ACC2921)” has a percentage (%) ofexpected binding response of lower than 6, preferably 4.5 (% expectedbinding response <6, preferably <4.5).

In one aspect the antibodies according to the invention compete withdeposited antibody DSM ACC2921 for binding to human CSF-1R. Such bindingcompletion may be determined using techniques known in the art. TheCSF-1R antibody is measured at 25° C. by Surface Plasmon Resonance (SPR)in an in vitro competitive binding inhibition assay to determine theability of the test antibody to inhibit binding of antibody<CSF-1R>7G5.3B6 (deposit no. DSM ACC2921) to human CSF-1R. This can beinvestigated by a BIAcore assay (Pharmacia Biosensor AB, Uppsala,Sweden) as e.g. in Example 5.

The “variable domain” (variable domain of a light chain (V_(L)),variable domain of a heavy chain (V_(H))) as used herein denotes each ofthe pair of light and heavy chain domains which are involved directly inbinding the antibody to the antigen. The variable light and heavy chaindomains have the same general structure and each domain comprises fourframework (FR) regions whose sequences are widely conserved, connectedby three “hypervariable regions” (or complementary determining regions,CDRs). The framework regions adopt a β-sheet conformation and the CDRsmay form loops connecting the β-sheet structure. The CDRs in each chainare held in their three-dimensional structure by the framework regionsand form together with the CDRs from the other chain the antigen bindingsite. The antibody's heavy and light chain CDR3 regions play aparticularly important role in the binding specificity/affinity of theantibodies according to the invention and therefore provide a furtherobject of the invention.

The term “antigen-binding portion of an antibody” when used herein referto the amino acid residues of an antibody which are responsible forantigen-binding. The antigen-binding portion of an antibody comprisesamino acid residues from the “complementary determining regions” or“CDRs”. “Framework” or “FR” regions are those variable domain regionsother than the hypervariable region residues as herein defined.Therefore, the light and heavy chain variable domains of an antibodycomprise from N- to C-terminus the domains FR1, CDR1, FR2, CDR2, FR3,CDR3, and FR4. Especially, CDR3 of the heavy chain is the region whichcontributes most to antigen binding and defines the antibody'sproperties. CDR and FR regions are determined according to the standarddefinition of Kabat, E. A., et al., Sequences of Proteins ofImmunological Interest, 5th ed., Public Health Service, NationalInstitutes of Health, Bethesda, Md. (1991) and/or those residues from a“hypervariable loop”.

The terms “nucleic acid” or “nucleic acid molecule”, as used herein, areintended to include DNA molecules and RNA molecules. A nucleic acidmolecule may be single-stranded or double-stranded, but preferably isdouble-stranded DNA.

The term “amino acid” as used within this application denotes the groupof naturally occurring carboxy α-amino acids comprising alanine (threeletter code: ala, one letter code: A), arginine (arg, R), asparagine(asn, N), aspartic acid (asp, D), cysteine (cys, C), glutamine (gln, Q),glutamic acid (glu, E), glycine (gly, G), histidine (his, H), isoleucine(ile, I), leucine (leu, L), lysine (lys, K), methionine (met, M),phenylalanine (phe, F), proline (pro, P), serine (ser, S), threonine(thr, T), tryptophan (trp, W), tyrosine (tyr, Y), and valine (val, V).

An “immunoconjugate” is an antibody conjugated to one or moreheterologous molecule(s), including but not limited to a cytotoxicagent.

An “individual” or “subject” is a mammal. Mammals include, but are notlimited to, domesticated animals (e.g., cows, sheep, cats, dogs, andhorses), primates (e.g., humans and non-human primates such as monkeys),rabbits, and rodents (e.g., mice and rats). In certain embodiments, theindividual or subject is a human.

An “isolated” antibody is one which has been separated from a componentof its natural environment. In some embodiments, an antibody is purifiedto greater than 95% or 99% purity as determined by, for example,electrophoretic (e.g., SDS-PAGE, isoelectric focusing (IEF), capillaryelectrophoresis) or chromatographic (e.g., ion exchange or reverse phaseHPLC). For review of methods for assessment of antibody purity, see,e.g., Flatman et al., J. Chromatogr. B 848:79-87 (2007).

An “isolated” nucleic acid refers to a nucleic acid molecule that hasbeen separated from a component of its natural environment. An isolatednucleic acid includes a nucleic acid molecule contained in cells thatordinarily contain the nucleic acid molecule, but the nucleic acidmolecule is present extrachromosomally or at a chromosomal location thatis different from its natural chromosomal location.

“Isolated nucleic acid encoding an anti-CSF-1R antibody” refers to oneor more nucleic acid molecules encoding antibody heavy and light chains(or fragments thereof), including such nucleic acid molecule(s) in asingle vector or separate vectors, and such nucleic acid molecule(s)present at one or more locations in a host cell.

“Native antibodies” refer to naturally occurring immunoglobulinmolecules with varying structures. For example, native IgG antibodiesare heterotetrameric glycoproteins of about 150,000 daltons, composed oftwo identical light chains and two identical heavy chains that aredisulfide-bonded. From N- to C-terminus, each heavy chain has a variableregion (VH), also called a variable heavy domain or a heavy chainvariable domain, followed by three constant domains (CH1, CH2, and CH3).Similarly, from N- to C-terminus, each light chain has a variable region(VL), also called a variable light domain or a light chain variabledomain, followed by a constant light (CL) domain. The light chain of anantibody may be assigned to one of two types, called kappa (κ) andlambda (λ), based on the amino acid sequence of its constant domain.

The term “package insert” is used to refer to instructions customarilyincluded in commercial packages of therapeutic products, that containinformation about the indications, usage, dosage, administration,combination therapy, contraindications and/or warnings concerning theuse of such therapeutic products.

“Percent (%) amino acid sequence identity” with respect to a referencepolypeptide sequence is defined as the percentage of amino acid residuesin a candidate sequence that are identical with the amino acid residuesin the reference polypeptide sequence, after aligning the sequences andintroducing gaps, if necessary, to achieve the maximum percent sequenceidentity, and not considering any conservative substitutions as part ofthe sequence identity. Alignment for purposes of determining percentamino acid sequence identity can be achieved in various ways that arewithin the skill in the art, for instance, using publicly availablecomputer software such as BLAST, BLAST-2, ALIGN or Megalign (DNASTAR)software. Those skilled in the art can determine appropriate parametersfor aligning sequences, including any algorithms needed to achievemaximal alignment over the full length of the sequences being compared.For purposes herein, however, % amino acid sequence identity values aregenerated using the sequence comparison computer program ALIGN-2. TheALIGN-2 sequence comparison computer program was authored by Genentech,Inc., and the source code has been filed with user documentation in theU.S. Copyright Office, Washington D.C., 20559, where it is registeredunder U.S. Copyright Registration No. TXU510087. The ALIGN-2 program ispublicly available from Genentech, Inc., South San Francisco, Calif., ormay be compiled from the source code. The ALIGN-2 program should becompiled for use on a UNIX operating system, including digital UNIXV4.0D. All sequence comparison parameters are set by the ALIGN-2 programand do not vary.

In situations where ALIGN-2 is employed for amino acid sequencecomparisons, the % amino acid sequence identity of a given amino acidsequence A to, with, or against a given amino acid sequence B (which canalternatively be phrased as a given amino acid sequence A that has orcomprises a certain % amino acid sequence identity to, with, or againsta given amino acid sequence B) is calculated as follows:100 times the fraction X/Ywhere X is the number of amino acid residues scored as identical matchesby the sequence alignment program ALIGN-2 in that program's alignment ofA and B, and where Y is the total number of amino acid residues in B. Itwill be appreciated that where the length of amino acid sequence A isnot equal to the length of amino acid sequence B, the % amino acidsequence identity of A to B will not equal the % amino acid sequenceidentity of B to A. Unless specifically stated otherwise, all % aminoacid sequence identity values used herein are obtained as described inthe immediately preceding paragraph using the ALIGN-2 computer program.

II. Compositions and Methods

In one aspect, the invention is based, in part, on to same epitope asthe deposited antibody DSM ACC2921. Antibodies of the invention areuseful, e.g., for the diagnosis or treatment of cancer, of inflammatorydiseases or of bone loss; or for the prevention or treatment ofmetastasis.

Exemplary Anti-CSF-1R Antibodies

In one aspect, the invention provides antibodies that bind to humanCSF-1R. In certain embodiments, the anti-CSF-1R antibody ischaracterized in binding to same epitope as the deposited antibody DSMACC2921.

-   Another aspect of the invention is an antibody binding to human    CSF-1R, characterized in that-   a) the heavy chain variable domain comprises a CDR3 region of SEQ ID    NO: 1, a CDR2 region of SEQ ID NO: 2, and a CDR1 region of SEQ ID    NO:3, and the light chain variable domain comprises a CDR3 region of    SEQ ID NO: 4, a CDR2 region of SEQ ID NO:5, and a CDR1 region of SEQ    ID NO:6; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a).-   Another aspect of the invention is an antibody binding to human    CSF-1R, characterized in that-   a) the heavy chain variable domain comprises a CDR3 region of SEQ ID    NO: 1, a CDR2 region of SEQ ID NO: 2, and a CDR1 region of SEQ ID    NO:3, and the light chain variable domain comprises a CDR3 region of    SEQ ID NO: 4, a CDR2 region of SEQ ID NO:5, and a CDR1 region of SEQ    ID NO:6; or-   b) a CDR grafted, humanized or T cell epitope depleted antibody    variant of the antibodies of a), and    having one or more of the following properties (determined in assays    as described in Example 2, 3, 4, 6, 7 and 8):    -   the anti-CSF-1R antibody inhibits CSF-1 binding to CSF-1R with        an IC50 of 25 ng/ml or lower, in one embodiment with an IC50 of        20 ng/ml or lower;    -   the anti-CSF-1R antibody inhibits CSF-1-induced CSF-1R        phosphorylation (in NIH3T3-CSF-1R recombinant cells) with an        IC50 of 100 ng/ml or lower, in one embodiment with an IC50 of 50        ng/ml or lower;    -   the anti-CSF-1R antibody inhibits the growth of recombinant        NIH3T3 cells expressing human CSF-1R (SEQ ID No: 15) by 80% or        more (as compared to the absence of antibody), preferably by 90%        or more;    -   the anti-CSF-1R antibody inhibits the growth of BeWo tumor cells        (ATCC CCL-98) by 80% or more (at a antibody concentration of 10        μg/ml; and as compared to the absence of antibody), preferably        by 90% or more;    -   the anti-CSF-1R antibody inhibits macrophage differentiation (In        one embodiment the anti-CSF-1R antibody inhibits the survival of        monocytes with an IC50 of 1.5 nM or lower, preferably with an        IC50 of 1.0 nM or lower); or    -   the anti-CSF-1R antibody is binding to human CSF-1R with a        binding affinity of KD=1.0×10⁻⁹ mol/1 or lower at 35° C.

In another aspect, an anti-CSF-1R antibody according to the inventioncomprises in the heavy chain variable domain (VH) sequence a) a CDR1Hhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:3, b) a CDR2Hhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:2 and c) a CDR3Hhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:1.

In certain embodiments, a heavy chain variable domain (VH) sequencecomprising a) a CDR1H having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:3, b) a CDR2H having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:2, and c) a CDR3H having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:1, contains substitutions (e.g., conservative substitutions),insertions, or deletions relative to the reference sequence, but an antiCSF-1R antibody comprising that sequence retains the ability to bind toCSF-1R.

In another aspect, an anti-CSF-1R antibody according to the inventioncomprises in the light chain variable domain (VL) sequence a) a CDR1Lhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:6, b) a CDR2Lhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:5, and c) a CDR3Lhaving an amino acid sequence identical to, or comprising 1, 2, or 3amino acid residue substitutions relative to SEQ ID NO:4.

In certain embodiments, a light chain variable domain (VL) sequencecomprising a) a CDR1L having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:6, b) a CDR2L having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:5, and c) a CDR3L having an amino acid sequence identical to, orcomprising 1, 2, or 3 amino acid residue substitutions relative to SEQID NO:4, contains substitutions (e.g., conservative substitutions),insertions, or deletions relative to the reference sequence, but an antiCSF-1R antibody comprising that sequence retains the ability to bind toCSF-1R.

In another aspect, an anti-CSF-1R antibody according to the invention

-   -   comprises in the heavy chain variable domain (VH) sequence a) a        CDR1H having an amino acid sequence identical to, or comprising        1, 2, or 3 amino acid residue substitutions relative to SEQ ID        NO:3, b) a CDR2H having an amino acid sequence identical to, or        comprising 1, 2, or 3 amino acid residue substitutions relative        to SEQ ID NO:2, and c) a CDR3H having an amino acid sequence        identical to, or comprising 1, 2, or 3 amino acid residue        substitutions relative to SEQ ID NO:1, and comprises in the        light chain variable domain (VL) sequence d) a having an amino        acid sequence identical to, or comprising 1, 2, or 3 amino acid        residue substitutions relative to SEQ ID NO:6, e) a CDR2L having        an amino acid sequence identical to, or comprising 1, 2, or 3        amino acid residue substitutions relative to SEQ ID NO:5, and f)        a CDR3L having an amino acid sequence identical to, or        comprising 1, 2, or 3 amino acid residue substitutions relative        to SEQ ID NO:4.

In another aspect, an anti-CSF-1R antibody according to the invention

-   -   comprises in the heavy chain variable domain (VH) sequence a) a        CDR1H having an amino acid sequence identical to, or comprising        1, 2, or 3 amino acid residue substitutions relative to SEQ ID        NO:3, b) a CDR2H having an amino acid sequence identical to, or        comprising 1, 2, or 3 amino acid residue substitutions relative        to SEQ ID NO:2, and c) a CDR3H having an amino acid sequence        identical to, or comprising 1, 2, or 3 amino acid residue        substitutions relative to SEQ ID NO:1, and comprises in the        light chain variable domain (VL) sequence d) a CDR1L having an        amino acid sequence identical to, or comprising 1, 2, or 3 amino        acid residue substitutions relative to SEQ ID NO:6, e) a CDR2L        having an amino acid sequence identical to, or comprising 1, 2,        or 3 amino acid residue substitutions relative to SEQ ID NO:5,        and f) a CDR3L having an amino acid sequence identical to, or        comprising 1, 2, or 3 amino acid residue substitutions relative        to SEQ ID NO:4; and        the anti-CSF-1R antibody has one or more of the following        properties (determined in assays as described in Example 2, 3,        4, 6, 7 and 8):    -   the anti-CSF-1R antibody inhibits CSF-1 binding to CSF-1R with        an IC50 of 25 ng/ml or lower, in one embodiment with an IC50 of        20 ng/ml or lower;    -   the anti-CSF-1R antibody inhibits CSF-1-induced CSF-1R        phosphorylation (in NIH3T3-CSF-1R recombinant cells) with an        IC50 of 100 ng/ml or lower, in one embodiment with an IC50 of 50        ng/ml or lower;    -   the anti-CSF-1R antibody inhibits the growth of recombinant        NIH3T3 cells expressing human CSF-1R (SEQ ID No: 15) by 80% or        more (as compared to the absence of antibody), preferably by 90%        or more;    -   the anti-CSF-1R antibody inhibits the growth of BeWo tumor cells        (ATCC CCL-98) by 80% or more (at a antibody concentration of 10        μg/ml; and as compared to the absence of antibody), preferably        by 90% or more;    -   the anti-CSF-1R antibody inhibits macrophage differentiation (In        one embodiment the anti-CSF-1R antibody inhibits the survival of        monocytes with an IC50 of 1.5 nM or lower, preferably with an        IC50 of 1.0 nM or lower); or    -   the anti-CSF-1R antibody is binding to human CSF-1R with a        binding affinity of KD=1.0×10⁻⁹ mol/1 or lower at 35° C.        Recombinant Methods and Compositions

The antibodies according to the invention are preferably produced byrecombinant means. Such methods are widely known in the state of the artand comprise protein expression in prokaryotic and eukaryotic cells withsubsequent isolation of the antibody polypeptide and usuallypurification to a pharmaceutically acceptable purity. For the proteinexpression nucleic acids encoding light and heavy chains or fragmentsthereof are inserted into expression vectors by standard methods.Expression is performed in appropriate prokaryotic or eukaryotic hostcells, such as CHO cells, NS0 cells, SP2/0 cells, HEK293 cells, COScells, yeast, or E. coli cells, and the antibody is recovered from thecells (from the supernatant or after cells lysis).

Recombinant production of antibodies is well-known in the state of theart and described, for example, in the review articles of Makrides, S.C., Protein Expr. Purif. 17 (1999) 183-202; Geisse, S., et al., ProteinExpr. Purif. 8 (1996) 271-282; Kaufman, R. J., Mol. Biotechnol. 16(2000) 151-161; Werner, R. G., Drug Res. 48 (1998) 870-880.

The antibodies may be present in whole cells, in a cell lysate, or in apartially purified, or substantially pure form. Purification isperformed in order to eliminate other cellular components or othercontaminants, e.g. other cellular nucleic acids or proteins, by standardtechniques, including alkaline/SDS treatment, CsCl banding, columnchromatography, agarose gel electrophoresis, and others well known inthe art. See Ausubel, F., et al., ed. Current Protocols in MolecularBiology, Greene Publishing and Wiley Interscience, New York (1987).

Expression in NS0 cells is described by, e.g., Barnes, L. M., et al.,Cytotechnology 32 (2000) 109-123; Barnes, L. M., et al., Biotech.Bioeng. 73 (2001) 261-270. Transient expression is described by, e.g.,Durocher, Y., et al., Nucl. Acids. Res. 30 (2002) E9. Cloning ofvariable domains is described by Orlandi, R., et al., Proc. Natl. Acad.Sci. USA 86 (1989) 3833-3837; Carter, P., et al., Proc. Natl. Acad. Sci.USA 89 (1992) 4285-4289; Norderhaug, L., et al., J. Immunol. Methods 204(1997) 77-87. A preferred transient expression system (HEK 293) isdescribed by Schlaeger, E.-J., Christensen, K., in Cytotechnology 30(1999) 71-83, and by Schlaeger, E.-J., in J. Immunol. Methods 194 (1996)191-199.

The control sequences that are suitable for prokaryotes, for example,include a promoter, optionally an operator sequence, and a ribosomebinding site. Eukaryotic cells are known to utilize promoters, enhancersand polyadenylation signals.

Nucleic acid is “operably linked” when it is placed into a functionalrelationship with another nucleic acid sequence. For example, DNA for apresequence or secretory leader is operably linked to DNA for apolypeptide if it is expressed as a preprotein that participates in thesecretion of the polypeptide; a promoter or enhancer is operably linkedto a coding sequence if it affects the transcription of the sequence; ora ribosome binding site is operably linked to a coding sequence if it ispositioned so as to facilitate translation. Generally, “operably linked”means that the DNA sequences being linked are contiguous, and, in thecase of a secretory leader, contiguous and in reading frame. However,enhancers do not have to be contiguous. Linking is accomplished byligation at convenient restriction sites. If such sites do not exist,the synthetic oligonucleotide adaptors or linkers are used in accordancewith conventional practice.

Monoclonal antibodies are suitably separated from the culture medium byconventional immunoglobulin purification procedures such as, forexample, protein A-Sepharose, hydroxylapatite chromatography, gelelectrophoresis, dialysis, or affinity chromatography. DNA and RNAencoding the monoclonal antibodies is readily isolated and sequencedusing conventional procedures. The hybridoma cells can serve as a sourceof such DNA and RNA. Once isolated, the DNA may be inserted intoexpression vectors, which are then transfected into host cells, such asHEK 293 cells, CHO cells, or myeloma cells that do not otherwise produceimmunoglobulin protein, to obtain the synthesis of recombinantmonoclonal antibodies in the host cells.

Nucleic acid molecules encoding amino acid sequence variants ofanti-CSF-1R antibody are prepared by a variety of methods known in theart. These methods include, but are not limited to, isolation from anatural source (in the case of naturally occurring amino acid sequencevariants) or preparation by oligonucleotide-mediated (or site-directed)mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlierprepared variant or a non-variant version of humanized anti-CSF-1Rantibody.

The heavy and light chain variable domains according to the inventionare combined with sequences of promoter, translation initiation,constant region, 3′ untranslated region, polyadenylation, andtranscription termination to form expression vector constructs. Theheavy and light chain expression constructs can be combined into asingle vector, co-transfected, serially transfected, or separatelytransfected into host cells which are then fused to form a single hostcell expressing both chains.

As used herein, the expressions “cell”, “cell line”, and “cell culture”are used interchangeably and all such designations include progeny.Thus, the words “transformants” and “transformed cells” include theprimary subject cell and cultures derived therefrom without regard forthe number of transfers. It is also understood that all progeny may notbe precisely identical in DNA content, due to deliberate or inadvertentmutations. Variant progeny that have the same function or biologicalactivity as screened for in the originally transformed cell areincluded.

The “Fc part” of an antibody is not involved directly in binding of anantibody to an antigen, but exhibit various effector functions. A “Fcpart of an antibody” is a term well known to the skilled artisan anddefined on the basis of papain cleavage of antibodies. Depending on theamino acid sequence of the constant region of their heavy chains,antibodies or immunoglobulins are divided in the classes: IgA, IgD, IgE,IgG and IgM, and several of these may be further divided into subclasses(isotypes), e.g. IgG1, IgG2, IgG3, and IgG4, IgA1, and IgA2. Accordingto the heavy chain constant regions the different classes ofimmunoglobulins are called α, δ, ε, γ, and μ, respectively. The Fc partof an antibody is directly involved in ADCC (antibody-dependentcell-mediated cytotoxicity) and CDC (complement-dependent cytotoxicity)based on complement activation, C1q binding and Fc receptor binding.Complement activation (CDC) is initiated by binding of complement factorC1q to the Fc part of most IgG antibody subclasses. While the influenceof an antibody on the complement system is dependent on certainconditions, binding to C1q is caused by defined binding sites in the Fcpart. Such binding sites are known in the state of the art and describede.g. by Boackle, R. J., et al., Nature 282 (1979) 742-743, Lukas, T. J.,et al., J. Immunol. 127 (1981) 2555-2560, Brunhouse, R., and Cebra, J.J., Mol. Immunol. 16 (1979) 907-917, Burton, D. R., et al., Nature 288(1980) 338-344, Thommesen, J. E., et al., Mol. Immunol. 37 (2000)995-1004, Idusogie, E. E., et al., J. Immunol. 164 (2000) 4178-4184,Hezareh, M., et al., J. Virology 75 (2001) 12161-12168, Morgan, A., etal., Immunology 86 (1995) 319-324, EP 0307434. Such binding sites aree.g. L234, L235, D270, N297, E318, K320, K322, P331 and P329 (numberingaccording to EU index of Kabat, E. A., see below). Antibodies ofsubclass IgG1, IgG2 and IgG3 usually show complement activation and C1qand C3 binding, whereas IgG4 do not activate the complement system anddo not bind C1q and C3.

In one embodiment the antibody according to the invention comprises a Fcpart derived from human origin and preferably all other parts of thehuman constant regions. As used herein the term “Fc part derived fromhuman origin” denotes a Fc part which is either a Fc part of a humanantibody of the subclass IgG1, IgG2, IgG3 or IgG4, preferably a Fc partfrom human IgG1 subclass, a mutated Fc part from human IgG1 subclass(preferably with a mutation on L234A+L235A), a Fc part from human IgG4subclass or a mutated Fc part from human IgG4 subclass (preferably witha mutation on S228P). Mostly preferred are the human heavy chainconstant regions of SEQ ID NO:11 (human IgG1 subclass), SEQ ID NO: 12(human IgG1 subclass with mutations L234A and L235A), SEQ ID NO:13 humanIgG4 subclass), or SEQ ID NO:14 (human IgG4 subclass with mutationS228P).

In one embodiment the antibody according to the invention ischaracterized in that the constant chains are of human origin. Suchconstant chains are well known in the state of the art and e.g.described by Kabat, E. A., (see e.g. Johnson, G. and Wu, T. T., NucleicAcids Res. 28 (2000) 214-218). For example, a useful human heavy chainconstant region comprises an amino acid sequence of SEQ ID NO: 9. Forexample, a useful human light chain constant region comprises an aminoacid sequence of a kappa-light chain constant region of SEQ ID NO: 10.It is further preferred that the antibody is of mouse origin andcomprises the antibody variable sequence frame of a mouse antibodyaccording to Kabat.

Immunoconjugates

The invention also provides immunoconjugates comprising an anti-CSF-1Rantibody herein conjugated to one or more cytotoxic agents, such aschemotherapeutic agents or drugs, growth inhibitory agents, toxins(e.g., protein toxins, enzymatically active toxins of bacterial, fungal,plant, or animal origin, or fragments thereof), or radioactive isotopes.

In one embodiment, an immunoconjugate is an antibody-drug conjugate(ADC) in which an antibody is conjugated to one or more drugs, includingbut not limited to a maytansinoid (see U.S. Pat. Nos. 5,208,020,5,416,064 and European Patent EP 0 425 235 B1); an auristatin such asmonomethylauristatin drug moieties DE and DF (MMAE and MMAF) (see U.S.Pat. Nos. 5,635,483 and 5,780,588, and 7,498,298); a dolastatin; acalicheamicin or derivative thereof (see U.S. Pat. Nos. 5,712,374,5,714,586, 5,739,116, 5,767,285, 5,770,701, 5,770,710, 5,773,001, and5,877,296; Hinman et al., Cancer Res. 53:3336-3342 (1993); and Lode etal., Cancer Res. 58:2925-2928 (1998)); an anthracycline such asdaunomycin or doxorubicin (see Kratz et al., Current Med. Chem.13:477-523 (2006); Jeffrey et al., Bioorganic & Med. Chem. Letters16:358-362 (2006); Torgov et al., Bioconj. Chem. 16:717-721 (2005); Nagyet al., Proc. Natl. Acad. Sci. USA 97:829-834 (2000); Dubowchik et al.,Bioorg. & Med. Chem. Letters 12:1529-1532 (2002); King et al., J. Med.Chem. 45:4336-4343 (2002); and U.S. Pat. No. 6,630,579); methotrexate;vindesine; a taxane such as docetaxel, paclitaxel, larotaxel, tesetaxel,and ortataxel; a trichothecene; and CC1065.

In another embodiment, an immunoconjugate comprises an antibody asdescribed herein conjugated to an enzymatically active toxin or fragmentthereof, including but not limited to diphtheria A chain, nonbindingactive fragments of diphtheria toxin, exotoxin A chain (from Pseudomonasaeruginosa), ricin A chain, abrin A chain, modeccin A chain,alpha-sarcin, Aleurites fordii proteins, dianthin proteins, Phytolacaamericana proteins (PAPI, PAPII, and PAP-S), momordica charantiainhibitor, curcin, crotin, sapaonaria officinalis inhibitor, gelonin,mitogellin, restrictocin, phenomycin, enomycin, and the tricothecenes.

In another embodiment, an immunoconjugate comprises an antibody asdescribed herein conjugated to a radioactive atom to form aradioconjugate. A variety of radioactive isotopes are available for theproduction of radioconjugates. Examples include At²¹¹, I¹³¹, I¹²⁵, Y⁹⁰,Re¹⁸⁶, Re¹⁸⁸, Sm¹⁵³, Bi²¹², P³², Pb²¹² and radioactive isotopes of Lu.When the radioconjugate is used for detection, it may comprise aradioactive atom for scintigraphic studies, for example tc99m or I123,or a spin label for nuclear magnetic resonance (NMR) imaging (also knownas magnetic resonance imaging, mri), such as iodine-123 again,iodine-131, indium-111, fluorine-19, carbon-13, nitrogen-15, oxygen-17,gadolinium, manganese or iron.

Conjugates of an antibody and cytotoxic agent may be made using avariety of bifunctional protein coupling agents such asN-succinimidyl-3-(2-pyridyldithio) propionate (SPDP),succinimidyl-4-(N-maleimidomethyl)cyclohexane-1-carboxylate (SMCC),iminothiolane (IT), bifunctional derivatives of imidoesters (such asdimethyl adipimidate HCl), active esters (such as disuccinimidylsuberate), aldehydes (such as glutaraldehyde), bis-azido compounds (suchas bis(p-azidobenzoyl) hexanediamine), bis-diazonium derivatives (suchas bis-(p-diazoniumbenzoyl)-ethylenediamine), diisocyanates (such astoluene 2,6-diisocyanate), and bis-active fluorine compounds (such as1,5-difluoro-2,4-dinitrobenzene). For example, a ricin immunotoxin canbe prepared as described in Vitetta et al., Science 238:1098 (1987).Carbon-14-labeled 1-isothiocyanatobenzyl-3-methyldiethylenetriaminepentaacetic acid (MX-DTPA) is an exemplary chelating agent forconjugation of radionucleotide to the antibody. See WO94/11026. Thelinker may be a “cleavable linker” facilitating release of a cytotoxicdrug in the cell. For example, an acid-labile linker,peptidase-sensitive linker, photolabile linker, dimethyl linker ordisulfide-containing linker (Chari et al., Cancer Res. 52:127-131(1992); U.S. Pat. No. 5,208,020) may be used.

The immunuoconjugates or ADCs herein expressly contemplate, but are notlimited to such conjugates prepared with cross-linker reagentsincluding, but not limited to, BMPS, EMCS, GMBS, HBVS, LC-SMCC, MBS,MPBH, SBAP, SIA, SIAB, SMCC, SMPB, SMPH, sulfo-EMCS, sulfo-GMBS,sulfo-KMUS, sulfo-MBS, sulfo-SIAB, sulfo-SMCC, and sulfo-SMPB, and SVSB(succinimidyl-(4-vinylsulfone)benzoate) which are commercially available(e.g., from Pierce Biotechnology, Inc., Rockford, Ill., U.S.A).

Therapeutic Methods and Compositions

The invention comprises a method for the treatment of a patient in needof therapy, characterized by administering to the patient atherapeutically effective amount of an antibody according to theinvention.

The invention comprises the use of an antibody according to theinvention for therapy.

One preferred embodiment of the invention are the CSF-1R antibodies ofthe present invention for use in the treatment of “CSF-1R mediateddiseases” or the CSF-1R antibodies of the present invention for use forthe manufacture of a medicament in the treatment of “CSF-1R mediateddiseases”, which can be described as follows:

There are 3 distinct mechanisms by which CSF-1R signaling is likelyinvolved in tumor growth and metastasis. The first is that expression ofCSF-ligand and receptor has been found in tumor cells originating in thefemale reproductive system (breast, ovarian, endometrium, cervical)(Scholl, S. M., et al., J. Natl. Cancer Inst. 86 (1994) 120-126;Kacinski, B. M., Mol. Reprod. Dev. 46 (1997) 71-74; Ngan, H. Y., et al.,Eur. J. Cancer 35 (1999) 1546-1550; Kirma, N., et al., Cancer Res 67(2007) 1918-1926) and the expression has been associated with breastcancer xenograft growth as well as poor prognosis in breast cancerpatients. Two point mutations were seen in CSF-1R in about 10-20% ofacute myelocytic leukemia, chronic myelocytic leukemia andmyelodysplasia patients tested in one study, and one of mutations wasfound to disrupt receptor turnover (Ridge, S. A., et al., Proc. Natl.Acad. Sci USA 87 (1990) 1377-1380). However the incidence of themutations could not be confirmed in later studies (Abu-Duhier, F. M., etal., Br. J. Haematol. 120 (2003) 464-470). Mutations were also found insome cases of hepatocellular cancer (Yang, D. H., et al., HepatobiliaryPancreat. Dis. Int. 3 (2004) 86-89) and idiopathic myelofibrosis(Abu-Duhier, F. M., et al., Br. J. Haematol. 120 (2003) 464-470).

Pigmented villonodular synovitis (PVNS) and Tenosynovial Giant celltumors (TGCT) can occur as a result of a translocation that fuses theM-CSF gene to a collagen gene COL6A3 and results in overexpression ofM-CSF (West, R. B., et al., Proc. Natl. Acad. Sci. USA 103 (2006)690-695). A landscape effect is proposed to be responsible for theresulting tumor mass that consists of monocytic cells attracted by cellsthat express M-CSF. TGCTs are smaller tumors that can be relativelyeasily removed from fingers where they mostly occur. PVNS is moreaggressive as it can recur in large joints and is not as easilycontrolled surgically.

The second mechanism is based on blocking signaling through M-CSF/CSF-1Rat metastatic sites in bone which induces osteoclastogenesis, boneresorption and osteolytic bone lesions. Breast, multiple myeloma andlung cancers are examples of cancers that have been found to metastasizeto the bone and cause osteolytic bone disease resulting in skeletalcomplications. M-CSF released by tumor cells and stroma induces thedifferentiation of hematopoietic myeloid monocyte progenitors to matureosteoclasts in collaboration with the receptor activator of nuclearfactor kappa-B ligand-RANKL. During this process, M-CSF acts as apermissive factor by giving the survival signal to osteoclasts (Tanaka,S., et al., J. Clin. Invest. 91 (1993) 257-263) Inhibition of CSF-1Ractivity during osteoclast differentiation and maturation with aanti-CSF-1R antibody is likely to prevent unbalanced activity ofosteoclasts that cause osteolytic disease and the associated skeletalrelated events in metastatic disease. Whereas breast, lung cancer andmultiple myeloma typically result in osteolytic lesions, metastasis tothe bone in prostate cancer initially has an osteoblastic appearance inwhich increased bone forming activity results in ‘woven bone’ which isdifferent from typical lamellar structure of normal bone. During diseaseprogression bone lesions display a significant osteolytic component aswell as high serum levels of bone resorption and suggests thatanti-resorptive therapy may be useful. Bisphosphonates have been shownto inhibit the formation of osteolytic lesions and reduced the number ofskeletal-related events only in men with hormone-refractory metastaticprostate cancer but at this point their effect on osteoblastic lesionsis controversial and bisphosphonates have not been beneficial inpreventing bone metastasis or hormone responsive prostate cancer todate. The effect of anti-resorptive agents in mixedosteolytic/osteoblastic prostate cancer is still being studied in theclinic (Choueiri, M. B., et al., Cancer Metastasis Rev. 25 (2006)601-609; Vessella, R. L. and Corey, E., Clin. Cancer Res. 12 (20 Pt 2)(2006) 6285s-6290s).

The third mechanism is based on the recent observation that tumorassociated macrophages (TAM) found in solid tumors of the breast,prostate, ovarian and cervical cancers correlated with poor prognosis(Bingle, L., et al., J. Pathol. 196 (2002) 254-265; Pollard, J. W., Nat.Rev. Cancer 4 (2004) 71-78). Macrophages are recruited to the tumor byM-CSF and other chemokines. The macrophages can then contribute to tumorprogression through the secretion of angiogenic factors, proteases andother growth factors and cytokines and may be blocked by inhibition ofCSF-1R signaling. Recently it was shown by Zins, K., et al (Zins, K., etal., Cancer Res. 67 (2007) 1038-1045) that expression of siRNA of Tumornecrosis factor alpha (TNF alpha), M-CSF or the combination of bothwould reduce tumor growth in a mouse xenograft model between 34% and 50%after intratumoral injection of the respective siRNA. SiRNA targetingthe TNF alpha secreted by the human SW620 cells reduced mouse M-CSFlevels and led to reduction of macrophages in the tumor. In additiontreatment of MCF7 tumor xenografts with an antigen binding fragmentdirected against M-CSF did result in 40% tumor growth inhibition,reversed the resistance to chemotherapeutics and improved survival ofthe mice when given in combination with chemotherapeutics (Paulus, P.,et al., Cancer Res. 66 (2006) 4349-4356).

TAMs are only one example of an emerging link between chronicinflammation and cancer. There is additional evidence for a link betweeninflammation and cancer as many chronic diseases are associated with anincreased risk of cancer, cancers arise at sites of chronicinflammation, chemical mediators of inflammation are found in manycancers; deletion of the cellular or chemical mediators of inflammationinhibits development of experimental cancers and long-term use ofanti-inflammatory agents reduce the risk of some cancers. A link tocancer exists for a number of inflammatory conditions among-those H.pylori induced gastritis for gastric cancer, Schistosomiasis for bladdercancer, HHVX for Kaposi's sarcoma, endometriosis for ovarian cancer andprostatitis for prostate cancer (Balkwill, F., et al., Cancer Cell 7(2005) 211-217). Macrophages are key cells in chronic inflammation andrespond differentially to their microenvironment. There are two types ofmacrophages that are considered extremes in a continuum of functionalstates: M1 macrophages are involved in Type 1 reactions. These reactionsinvolve the activation by microbial products and consequent killing ofpathogenic microorganisms that result in reactive oxygen intermediates.On the other end of the extreme are M2 macrophages involved in Type 2reactions that promote cell proliferation, tune inflammation andadaptive immunity and promote tissue remodeling, angiogenesis and repair(Mantovani, A., et al., Trends Immunol. 25 (2004) 677-686). Chronicinflammation resulting in established neoplasia is usually associatedwith M2 macrophages. A pivotal cytokine that mediates inflammatoryreactions is TNF alpha that true to its name can stimulate anti-tumorimmunity and hemorrhagic necrosis at high doses but has also recentlybeen found to be expressed by tumor cells and acting as a tumor promoter(Zins, K., et al., Cancer Res. 67 (2007) 1038-1045; Balkwill, F., CancerMetastasis Rev. 25 (2006) 409-416). The specific role of macrophageswith respect to the tumor still needs to be better understood includingthe potential spatial and temporal dependence on their function and therelevance to specific tumor types.

Thus one embodiment of the invention are the CSF-1R antibodies of thepresent invention for use in the treatment of cancer. The term “cancer”as used herein may be, for example, lung cancer, non small cell lung(NSCL) cancer, bronchioloalviolar cell lung cancer, bone cancer,pancreatic cancer, skin cancer, cancer of the head or neck, cutaneous orintraocular melanoma, uterine cancer, ovarian cancer, rectal cancer,cancer of the anal region, stomach cancer, gastric cancer, colon cancer,breast cancer, uterine cancer, carcinoma of the fallopian tubes,carcinoma of the endometrium, carcinoma of the cervix, carcinoma of thevagina, carcinoma of the vulva, Hodgkin's Disease, cancer of theesophagus, cancer of the small intestine, cancer of the endocrinesystem, cancer of the thyroid gland, cancer of the parathyroid gland,cancer of the adrenal gland, sarcoma of soft tissue, cancer of theurethra, cancer of the penis, prostate cancer, cancer of the bladder,cancer of the kidney or ureter, renal cell carcinoma, carcinoma of therenal pelvis, mesothelioma, hepatocellular cancer, biliary cancer,neoplasms of the central nervous system (CNS), spinal axis tumors, brainstem glioma, glioblastoma multiforme, astrocytomas, schwanomas,ependymonas, medulloblastomas, meningiomas, squamous cell carcinomas,pituitary adenoma, lymphoma, lymphocytic leukemia, including refractoryversions of any of the above cancers, or a combination of one or more ofthe above cancers. Preferably such cancer is a breast cancer, ovariancancer, cervical cancer, lung cancer or prostate cancer. Preferably suchcancers are further characterized by CSF-1 or CSF-1R expression oroverexpression. One further embodiment the invention are the CSF-1Rantibodies of the present invention for use in the simultaneoustreatment of primary tumors and new metastases.

Thus another embodiment of the invention are the CSF-1R antibodies ofthe present invention for use in the treatment of periodontitis,histiocytosis X, osteoporosis, Paget's disease of bone (PDB), bone lossdue to cancer therapy, periprosthetic osteolysis, glucocorticoid-inducedosteoporosis, rheumatoid arthritis, psiratic arthritis, osteoarthritis,inflammatory arthridities, and inflammation.

Rabello, D., et al., Biochem. Biophys. Res. Commun 347 (2006) 791-796has demonstrated that SNPs in the CSF1 gene exhibited a positiveassociation with aggressive periodontitis: an inflammatory disease ofthe periodontal tissues that causes tooth loss due to resorption of thealveolar bone.

Histiocytosis X (also called Langerhans cell histiocytosis, LCH) is aproliferative disease of Langerhans dendritic cells that appear todifferentiate into osteoclasts in bone and extraosseous LCH lesions.Langerhans cells are derived from circulating monocytes. Increasedlevels of M-CSF that have been measured in sera and lesions where foundto correlate with disease severity (da Costa, C. E., et al., J. Exp.Med. 201 (2005) 687-693). The disease occurs primarily in a pediatricpatient population and has to be treated with chemotherapy when thedisease becomes systemic or is recurrent.

The pathophysiology of osteoporosis is mediated by loss of bone formingosteoblasts and increased osteoclast dependent bone resorption.Supporting data has been described by Cenci et al showing that ananti-M-CSF antibody injection preserves bone density and inhibits boneresorption in ovariectomized mice (Cenci, S., et al., J. Clin. Invest.105 (2000) 1279-1287). Recently a potential link between postmenopausalbone loss due to estrogen deficiency was identified and found that thepresence of TNF alpha producing T-cell affected bone metabolism (Roggia,C., et al., Minerva Med. 95 (2004) 125-132). A possible mechanism couldbe the induction of M-CSF by TNF alpha in vivo. An important role forM-CSF in TNF-alpha-induced osteoclastogenesis was confirmed by theeffect of an antibody directed against M-CSF that blocked the TNF alphainduced osteolysis in mice and thereby making inhibitors of CSF-1Rsignaling potential targets for inflammatory arthritis (Kitaura, H., etal., J. Clin. Invest. 115 (2005) 3418-3427).

Paget's disease of bone (PDB) is the second most common bone metabolismdisorder after osteoporosis in which focal abnormalities of increasedbone turnover lead to complications such as bone pain, deformity,pathological fractures and deafness. Mutations in four genes have beenidentified that regulate normal osteoclast function and predisposeindividuals to PDB and related disorders: insertion mutations inTNFRSF11A, which encodes receptor activator of nuclear factor (NF)kappaB (RANK)-a critical regulator of osteoclast function, inactivatingmutations of TNFRSF11B which encodes osteoprotegerin (a decoy receptorfor RANK ligand), mutations of the sequestosome 1 gene (SQSTM1), whichencodes an important scaffold protein in the NFkappaB pathway andmutations in the valosin-containing protein (VCP) gene. This geneencodes VCP, which has a role in targeting the inhibitor of NFkappaB fordegradation by the proteasome (Daroszewska, A. and Ralston, S. H., Nat.Clin. Pract. Rheumatol. 2 (2006) 270-277). Targeted CSF-1R inhibitorsprovide an opportunity to block the deregulation of the RANKL signalingindirectly and add an additional treatment option to the currently usedbisphosphonates.

Cancer therapy induced bone loss especially in breast and prostatecancer patients is an additional indication where a targeted CSF-1Rinhibitor could prevent bone loss (Lester, J. E., et al., Br. J. Cancer94 (2006) 30-35). With the improved prognosis for early breast cancerthe long-term consequences of the adjuvant therapies become moreimportant as some of the therapies including chemotherapy, irradiation,aromatase inhibitors and ovary ablation affect bone metabolism bydecreasing the bone mineral density, resulting in increased risk forosteoporosis and associated fractures (Lester, J. E., et al., Br. J.Cancer 94 (2006) 30-35). The equivalent to adjuvant aromatase inhibitortherapy in breast cancer is androgen ablation therapy in prostate cancerwhich leads to loss of bone mineral density and significantly increasesthe risk of osteoporosis-related fractures (Stoch, S. A., et al., J.Clin. Endocrinol. Metab. 86 (2001) 2787-2791).

Targeted inhibition of CSF-1R signaling is likely to be beneficial inother indications as well when targeted cell types include osteoclastsand macrophages e.g. treatment of specific complications in response tojoint replacement as a consequence of rheumatoid arthritis. Implantfailure due to periprosthetic bone loss and consequent loosing ofprostheses is a major complication of joint replacement and requiresrepeated surgery with high socioeconomic burdens for the individualpatient and the health-care system. To date, there is no approved drugtherapy to prevent or inhibit periprosthetic osteolysis (Drees, P., etal., Nat. Clin. Pract. Rheumatol. 3 (2007) 165-171).

Glucocorticoid-induced osteoporosis (GIOP) is another indication inwhich a CSF-1R inhibitor could prevent bone loss after longtermglucocorticocosteroid use that is given as a result of variousconditions among those chronic obstructive pulmonary disease, asthma andrheumatoid arthritis (Guzman-Clark, J. R., et al., Arthritis Rheum. 57(2007) 140-146; Feldstein, A. C., et al., Osteoporos. Int. 16 (2005)2168-2174).

Rheumatoid arthritis, psioratic arthritis and inflammatory arthriditiesare in itself potential indications for CSF-1R signaling inhibitors inthat they consist of a macrophage component and to a varying degree bonedestruction (Ritchlin, C. T., et al., J. Clin. Invest. 111 (2003)821-831). Osteoarthritis and rheumatoid arthritis are inflammatoryautoimmune disease caused by the accumulation of macrophages in theconnective tissue and infiltration of macrophages into the synovialfluid, which is at least partially mediated by M-CSF. Campbell, I. K.,et al., J. Leukoc. Biol. 68 (2000) 144-150, demonstrated that M-CSF isproduced by human-joint tissue cells (chondrocytes, synovialfibroblasts) in vitro and is found in synovial fluid of patients withrheumatoid arthritis, suggesting that it contributes to the synovialtissue proliferation and macrophage infiltration which is associatedwith the pathogenesis of the disease Inhibition of CSF-1R signaling islikely to control the number of macrophages in the joint and alleviatethe pain from the associated bone destruction. In order to minimizeadverse affects and to further understand the impact of the CSF-1Rsignaling in these indications, one method is to specifically inhibitCSF-1R without targeting a myriad other kinases, such as Raf kinase.

Recent literature reports correlate increased circulating M-CSF withpoor prognosis and atherosclerotic progression in chronic coronaryartery disease (Saitoh, T., et al., J. Am. Coll. Cardiol. 35 (2000)655-665; Ikonomidis, I., et al., Eur. Heart. J. 26 (2005) p. 1618-1624);M-CSF influences the atherosclerotic process by aiding the formation offoam cells (macrophages with ingested oxidized LDL) that express CSF-1Rand represent the initial plaque (Murayama, T., et al., Circulation 99(1999) 1740-1746).

Expression and signaling of M-CSF and CSF-1R is found in activatedmicroglia. Microglia, which are resident macrophages of the centralnervous system, can be activated by various insults, including infectionand traumatic injury. M-CSF is considered a key regulator ofinflammatory responses in the brain and M-CSF levels increase in HIV-1,encephalitis, Alzheimer's disease (AD) and brain tumors. Microgliosis asa consequence of autocrine signaling by M-CSF/CSF-1R results ininduction of inflammatory cytokines and nitric oxides being released asdemonstrated by e.g. using an experimental neuronal damage model (Hao,A. J., et al., Neuroscience 112 (2002) 889-900; Murphy, G. M., Jr., etal., J. Biol. Chem. 273 (1998) 20967-20971). Microglia that haveincreased expression of CSF-1R are found to surround plaques in AD andin the amyloid precursor protein V717F transgenic mouse model of AD(Murphy, G. M., Jr., et al., Am. J. Pathol. 157 (2000) 895-904). On theother hand op/op mice with fewer microglia in the brain resulted infibrilar deposition of A-beta and neuronal loss compared to normalcontrol suggesting that microglia do have a neuroprotective function inthe development of AD lacking in the op/op mice (Kaku, M., et al., BrainRes. Brain Res. Protoc. 12 (2003) 104-108).

Expression and signaling of M-CSF and CSF-1R is associated withinflammatory bowel disease (IBD) (WO 2005/046657). The term“inflammatory bowel disease” refers to serious, chronic disorders of theintestinal tract characterised by chronic inflammation at various sitesin the gastrointestinal tract, and specifically includes ulcerativecolitis (UC) and Crohn's disease.

-   The invention the antibody characterized in comprising the antibody    binding to human CSF-1R being characterized by the above mentioned    epitope binding properties or alternatively by the above mentioned    amino acid sequences and amino acid sequence fragments for the    treatment of cancer.-   The invention the antibody characterized in comprising the antibody    binding to human CSF-1R being characterized by the above mentioned    epitope binding properties or alternatively by the above mentioned    amino acid sequences and amino acid sequence fragments for the    treatment of bone loss.-   The invention comprises the antibody characterized in comprising the    antibody binding to human CSF-1R being characterized by the above    mentioned epitope binding properties or alternatively by the above    mentioned amino acid sequences and amino acid sequence fragments for    the prevention or treatment of metastasis.-   The invention comprises the antibody characterized in comprising the    antibody binding to human CSF-1R being characterized by the above    mentioned epitope binding properties or alternatively by the above    mentioned amino acid sequences and amino acid sequence fragments for    treatment of inflammatory diseases.-   The invention comprises the use of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the above mentioned epitope binding properties or alternatively    by the above mentioned amino acid sequences and amino acid sequence    fragments for the treatment of cancer or alternatively for the    manufacture of a medicament for the treatment of cancer.-   The invention comprises the use of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the above mentioned epitope binding properties or alternatively    by the above mentioned amino acid sequences and amino acid sequence    fragments for the treatment of bone loss or alternatively for the    manufacture of a medicament for the treatment of bone loss.-   The invention comprises the use of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the above mentioned epitope binding properties or alternatively    by the above mentioned amino acid sequences and amino acid sequence    fragments for the prevention or treatment of metastasis or    alternatively for the manufacture of a medicament for the prevention    or treatment of metastasis.-   The invention comprises the use of an antibody characterized in    comprising the antibody binding to human CSF-1R being characterized    by the above mentioned epitope binding properties or alternatively    by the above mentioned amino acid sequences and amino acid sequence    fragments for treatment of inflammatory diseases or alternatively    for the manufacture of a medicament for the treatment of    inflammatory diseases.

In one embodiment the antibodies according to the invention inhibitCSF-1 binding to CSF-1R with an IC50 of 25 ng/ml or lower, preferablywith an IC50 of 20 ng/ml or lower. The IC50 of inhibition of CSF-1binding to CSF-1R can be determined as shown in Example 2.

In one embodiment the antibodies according to the invention inhibitCSF-1-induced CSF-1R phosphorylation (in NIH3T3-CSF-1R recombinantcells) with an IC50 of 100 ng/ml or lower, preferably with an IC50 of 50ng/ml or lower, more preferably with an IC50 of 25 ng/ml or lower. TheIC50 of CSF-1-induced CSF-1R phosphorylation can be determined as shownin Example 3.

In one embodiment the antibodies according to the invention inhibit thegrowth of recombinant NIH3T3 cells expressing human CSF-1R (SEQ ID No:15) by 80% or more (as compared to the absence of antibody), preferablyby 90% or more. The % growth inhibition is determined as shown inExample 6 wherein the % survival is measured. From the % survival the %growth inhibition are calculated as follows: % growth inhibition=100−%survival. E.g. <CSF-1R>7G5.3B6 shows a growth inhibition of wt humanCSF-1R expressing NIH3T3 cells of 100−0=100%.

In one embodiment the antibodies according to the invention stimulatethe growth of recombinant NIH3T3 cells expressing human mutant CSF-1RL301S Y969F (SEQ ID No: 16) by 5% or more (as compared to the absence ofantibody), preferably by 20% or more. The % growth stimulation isdetermined as shown in Example 6 wherein the % survival is measured.From the % survival the % growth stimulation are calculated as follows:% growth stimulation=−(100−% survival). E.g. <CSF-1R>7G5.3B6 shows agrowth stimulation of mutant human CSF-1R expressing NIH3T3 cells of−(100−0)=−(100−140) %=+40%.

In one embodiment the antibodies according to the invention inhibit thegrowth of BeWo tumor cells (ATCC CCL-98) by 80% or more (at a antibodyconcentration of 10 μg/ml; and as compared to the absence of antibody),preferably by 90% or more. The % growth inhibition is determined asshown in Example 7. E.g. <CSF-1R>7G5.3B6 shows a growth inhibition ofBeWo tumor cells of 101%.

In one embodiment the antibodies according to the invention inhibitmacrophage differentiation. In one embodiment the antibodies accordingto the invention inhibit the survival of monocytes with an IC50 of 1.5nM or lower, preferably with an IC50 of 1.0 nM or lower. The inhibitionof the survival of monocytes is determined as shown in Example 8.

A further embodiment of the invention is a method for the production ofan antibody against CSF-1R characterized in that the sequence of anucleic acid encoding the heavy chain of a human IgG1 class antibodybinding to human CSF-1R according to the invention said modified nucleicacid and the nucleic acid encoding the light chain of said antibody areinserted into an expression vector, said vector is inserted in aeukaryotic host cell, the encoded protein is expressed and recoveredfrom the host cell or the supernant.

Pharmaceutical Formulations

The term “pharmaceutical formulation” refers to a preparation which isin such form as to permit the biological activity of an activeingredient contained therein to be effective, and which contains noadditional components which are unacceptably toxic to a subject to whichthe formulation would be administered.

In another aspect, the present invention provides a composition, e.g. apharmaceutical composition, containing one or a combination ofmonoclonal antibodies, or the antigen-binding portion thereof, of thepresent invention, formulated together with a pharmaceuticallyacceptable carrier.

A “pharmaceutically acceptable carrier” refers to an ingredient in apharmaceutical formulation, other than an active ingredient, which isnontoxic to a subject. A pharmaceutically acceptable carrier includes,but is not limited to, a buffer, excipient, stabilizer, or preservative.As used herein, “pharmaceutically acceptable carrier” includes any andall solvents, dispersion media, coatings, antibacterial and antifungalagents, isotonic and absorption/resorption delaying agents, and the likethat are physiologically compatible. Preferably, the carrier is suitablefor injection or infusion.

A composition of the present invention can be administered by a varietyof methods known in the art. As will be appreciated by the skilledartisan, the route and/or mode of administration will vary dependingupon the desired results.

Pharmaceutically acceptable carriers include sterile aqueous solutionsor dispersions and sterile powders for the preparation of sterileinjectable solutions or dispersion. The use of such media and agents forpharmaceutically active substances is known in the art. In addition towater, the carrier can be, for example, an isotonic buffered salinesolution.

Regardless of the route of administration selected, the compounds of thepresent invention, which may be used in a suitable hydrated form, and/orthe pharmaceutical compositions of the present invention, are formulatedinto pharmaceutically acceptable dosage forms by conventional methodsknown to those of skill in the art.

Actual dosage levels of the active ingredients in the pharmaceuticalcompositions of the present invention may be varied so as to obtain anamount of the active ingredient which is effective to achieve thedesired therapeutic response for a particular patient, composition, andmode of administration, without being toxic to the patient (effectiveamount). The selected dosage level will depend upon a variety ofpharmacokinetic factors including the activity of the particularcompositions of the present invention employed, or the ester, salt oramide thereof, the route of administration, the time of administration,the rate of excretion of the particular compound being employed, otherdrugs, compounds and/or materials used in combination with theparticular compositions employed, the age, sex, weight, condition,general health and prior medical history of the patient being treated,and like factors well known in the medical arts.

The invention comprises the use of the antibodies according to theinvention for the treatment of a patient suffering from cancer,especially from colon, lung or pancreas cancer.

The invention comprises also a method for the treatment of a patientsuffering from such disease.

The invention further provides a method for the manufacture of apharmaceutical composition comprising an effective amount of an antibodyaccording to the invention together with a pharmaceutically acceptablecarrier and the use of the antibody according to the invention for sucha method.

The invention further provides the use of an antibody according to theinvention in an effective amount for the manufacture of a pharmaceuticalagent, preferably together with a pharmaceutically acceptable carrier,for the treatment of a patient suffering from cancer.

The invention also provides the use of an antibody according to theinvention in an effective amount for the manufacture of a pharmaceuticalagent, preferably together with a pharmaceutically acceptable carrier,for the treatment of a patient suffering from cancer.

Articles of Manufacture

In another aspect of the invention, an article of manufacture containingmaterials useful for the treatment, prevention and/or diagnosis of thedisorders described above is provided. The article of manufacturecomprises a container and a label or package insert on or associatedwith the container. Suitable containers include, for example, bottles,vials, syringes, IV solution bags, etc. The containers may be formedfrom a variety of materials such as glass or plastic. The containerholds a composition which is by itself or combined with anothercomposition effective for treating, preventing and/or diagnosing thecondition and may have a sterile access port (for example the containermay be an intravenous solution bag or a vial having a stopper pierceableby a hypodermic injection needle). At least one active agent in thecomposition is an antibody of the invention. The label or package insertindicates that the composition is used for treating the condition ofchoice. Moreover, the article of manufacture may comprise (a) a firstcontainer with a composition contained therein, wherein the compositioncomprises an antibody of the invention; and (b) a second container witha composition contained therein, wherein the composition comprises afurther cytotoxic or otherwise therapeutic agent. The article ofmanufacture in this embodiment of the invention may further comprise apackage insert indicating that the compositions can be used to treat aparticular condition. Alternatively, or additionally, the article ofmanufacture may further comprise a second (or third) containercomprising a pharmaceutically-acceptable buffer, such as bacteriostaticwater for injection (BWFI), phosphate-buffered saline, Ringer's solutionand dextrose solution. It may further include other materials desirablefrom a commercial and user standpoint, including other buffers,diluents, filters, needles, and syringes.

It is understood that any of the above articles of manufacture mayinclude an immunoconjugate of the invention in place of or in additionto an anti-CSF-1R antibody.

The following examples and sequence listing are provided to aid theunderstanding of the present invention, the true scope of which is setforth in the appended claims. It is understood that modifications can bemade in the procedures set forth without departing from the spirit ofthe invention.

Antibody Deposition

The following hybridoma has been deposited with Deutsche Sammlung vonMikroorganismen and Zellkulturen GmbH (DSMZ), Inhoffenstr. 7B, D-38124Braunschweig, Germany:

Cell line Deposition No. Date of Deposit <CSF-1R>7G5.3B6 DSM ACC2921Jun. 10, 2008Description of the Sequences

-   SEQ ID NO: 1 heavy chain CDR3, <CSF-1R>7G5.3B6-   SEQ ID NO: 2 heavy chain CDR2, <CSF-1R>7G5.3B6-   SEQ ID NO: 3 heavy chain CDR1, <CSF-1R>7G5.3B6-   SEQ ID NO: 4 light chain CDR3, <CSF-1R>7G5.3B6-   SEQ ID NO: 5 light chain CDR2, <CSF-1R>7G5.3B6-   SEQ ID NO: 6 light chain CDR1, <CSF-1R>7G5.3B6-   SEQ ID NO: 7 heavy chain variable domain, <CSF-1R>7G5.3B6-   SEQ ID NO: 8 light chain variable domain, <CSF-1R>7G5.3B6-   SEQ ID NO: 9 gamma1 heavy chain constant region-   SEQ ID NO: 10 κ light chain constant region-   SEQ ID NO: 11 human heavy chain constant region derived from IgG1-   SEQ ID NO: 12 human heavy chain constant region derived from IgG1    mutated on L234A and L235A-   SEQ ID NO: 13 human heavy chain constant region derived from IgG4-   SEQ ID NO: 14 human heavy chain constant region derived from IgG4    mutated onS228P-   SEQ ID NO: 15 wildtype CSF-1R (wt CSF-1R)-   SEQ ID NO: 16 mutant CSF-1R L301S Y969F

The following examples, sequence listing and FIGURES are provided to aidthe understanding of the present invention, the true scope of which isset forth in the appended claims. It is understood that modificationscan be made in the procedures set forth without departing from thespirit of the invention.

III. Examples Example 1 Generation of a Hybridoma Cell Line ProducingAnti-CSF-1R Antibodies

Immunization Procedure of NMRI Mice

NMRI mice were immunized with an expression vector pDisplay™(Invitrogen, USA) encoding the extracellular domain of huCSF-1R byutilizing electroporation. Every mouse was 4 times immunized with 100 μgDNA. When serum titers of anti-huCSF-1R were found to be sufficient,mice were additionally boosted once with 50 μg of a 1:1 mixture huCSF-1RECD/huCSF-1R ECDhuFc chimera in 200 μl PBS intravenously (i.v.) 4 and 3days before fusion.

Antigen Specific ELISA

Anti-CSF-1R titers in sera of immunized mice were determined by antigenspecific ELISA.

0.3 μg/ml huCSF-1R-huFc chimera (soluble extracellular domain) wascaptured on a streptavidin plate (MAXISORB®; MicroCoat, DE, Cat. No.11974998/MC1099) with 0.1 mg/ml biotinylated anti Fcγ (JacksonImmunoResearch., Cat. No. 109-066-098) and horse radish peroxidase(HRP)-conjugated F(ab′)₂ anti mouse IgG (GE Healthcare, UK, Cat. No.NA9310V) diluted 1/800 in PBS/0.05% Tween20/0.5% BSA was added. Serafrom all taps were diluted 1/40 in PBS/0.05% Tween20/0.5% BSA andserially diluted up to 1/1638400. Diluted sera were added to the wells.Pre-tap serum was used as negative control. A dilution series of mouseanti-human CSF-IR Mab3291 (R&D Systems, UK) from 500 ng/ml to 0.25 ng/mlwas used as positive control. All components were incubated together for1.5 hours, Wells were washed 6 times with PBST (PBS/0.2% Tween20) andassays were developed with freshly prepared ABTS® solution (1 mg/ml)(ABTS: 2,2′-azino bis(3-ethylbenzthiazoline-6-sulfonic acid) for 10minutes at RT. Absorbance was measured at 405 nm.

Hybridoma Generation

The mouse lymphocytes can be isolated and fused with a mouse myelomacell line using PEG based standard protocols to generate hybridomas. Theresulting hybridomas are then screened for the production ofantigen-specific antibodies. For example, single cell suspensions ofsplenic derived lymphocytes from immunized mice are fused to Ag8non-secreting mouse myeloma cells P3X63Ag8.653 (ATCC, CRL-1580) with 50%PEG. Cells are plated at approximately 10⁴ in flat bottom 96 well microtiter plate, followed by about two weeks incubation in selective medium.Individual wells are then screened by ELISA for human anti-CSF-1Rmonoclonal IgM and IgG antibodies. Once extensive hybridoma growthoccurs, the antibody secreting hybridomas are replated, screened again,and if still positive for human IgG, anti-CSF-1R monoclonal antibodies,can be subcloned by FACS. The stable subclones are then cultured invitro to produce antibody in tissue culture medium for characterization.

Culture of Hybridomas

Generated muMAb hybridomas were cultured in RPMI 1640 (PAN—Catalogue No.(Cat. No.) PO4-17500) supplemented with 2 mM L-glutamine (GIBCO—Cat. No.35050-038), 1 mM Na-Pyruvat (GIBCO—Cat. No. 11360-039), 1×NEAA(GIBCO—Cat. No. 11140-035), 10% FCS (PAA—Cat. No. A15-649), 1× Pen Strep(Roche—Cat. No. 1074440), 1× Nutridoma CS (Roche—Cat. No. 1363743), 50μM Mercaptoethanol (GIBCO—Cat. No. 31350-010) and 50 U/ml IL 6 mouse(Roche—Cat. No. 1 444 581) at 37° C. and 5% CO₂.

Example 2 Inhibition of CSF-1 Binding to CSF-1R (ELISA)

The test was performed on 384 well microtiter plates (MicroCoat, DE,Cat. No. 464718) at RT. After each incubation step plates were washed 3times with PBST.

At the beginning, plates were coated with 0.5 mg/ml goat F(ab′)₂biotinylated anti Fcγ (Jackson ImmunoResearch., Cat. No. 109-006-170)for 1 hour (h).

Thereafter the wells were blocked with PBS supplemented with 0.2%TWEEN®-20 and 2% BSA (Roche Diagnostics GmbH, DE) for 0.5 h. 75 ng/ml ofhuCSF-1R-huFc chimera (soluble extracellular domain) was immobilized toplate for 1 h. Then dilutions of purified antibodies in PBS/0.05%Tween20/0.5% BSA were incubated for 1 h. After adding a mixture of 3ng/ml CSF-1 (Biomol, DE, Cat. No. 60530), 50 ng/ml biotinylated antiCSF-1 clone BAF216 (R&D Systems, UK) and 1:5000 diluted streptavidin HRP(Roche Diagnostics GmbH, DE, Cat. No. 11089153001) for 1 h the plateswere washed 6 times with PBST. Anti CSF-IR SC-02, clone 2-4A5 (SantaCruz Biotechnology, US), which inhibits the ligand-receptor interaction,was used as positive control. Plates were developed with freshlyprepared BM BLUE® POD substrate solution (BM BLUE®:3,3′-5,5′-Tetramethylbenzidine, Roche Diagnostics GmbH, DE, Cat. No.11484281001) for 30 minutes at RT. Absorbance was measured at 370 nm.All anti-CSF-1R antibodies showed significant inhibition of the CSF-1binding to CSF-1R (see Table 1). Anti CSF-IR SC-02, clone 2-4A5 (SantaCruz Biotechnology, US), which inhibits the ligand-receptor interaction,was used as reference control.

TABLE 1 Calculated IC50 values for the inhibition of the CSF-1/CSF-1Rinteraction IC50 CSF-1/CSF-1R Antibody Inhibition [ng/ml]<CSF-1R>7G5.3B6 18.8 SC-02, clone 2-4A5 30.9

Example 3 Inhibition of CSF-1-Induced CSF-1R Phosphorylation inNIH3T3-CSF-1R Recombinant Cells

4.5×10³ NIH 3T3 cells, retrovirally infected with an expression vectorfor full-length CSF-1R, were cultured in DMEM (PAA Cat. No. E15-011), 2mM L-glutamine (Sigma, Cat. No. G7513, 2 mM Sodium pyruvate, 1×nonessential aminoacids, 10% FKS (PAA, Cat. No. A15-649) and 100 μg/mlPenStrep (Sigma, Cat. No. P4333 [10 mg/ml]) until they reachedconfluency. Thereafter cells were washed with serum-free DMEM media (PAACat. No. E15-011) supplemented with sodium selenite [5 ng/ml] (Sigma,Cat. No. S9133), transferrin [10 μg/ml] (Sigma, Cat. No. T8158), BSA[400 μg/ml] (Roche Diagnostics GmbH, Cat. No. 10735078), 4 mML-glutamine (Sigma, Cat. No. G7513), 2 mM sodium pyruvate (Gibco, Cat.No. 11360), 1× nonessential aminoacids (Gibco, Cat: 11140-035),2-mercaptoethanol [0.05 mM] (Merck, Cat. No. M7522), 100 μg/ml andPenStrep (Sigma, Cat. No. P4333) and incubated in 30 μl of the samemedium for 16 hours to allow for receptor up-regulation. 10 μl ofdiluted anti-CSR-1R antibodies were added to the cells for 1.5 h. Thencells were stimulated with 10 μl of 100 ng/ml huM-CSF-1 (Biomol Cat. No.60530) for 5 min After the incubation, supernatant was removed, cellswere washed twice with 80 μl of ice-cold PBS and 50 μl of freshlyprepared ice-cold lysis buffer (150 mM NaCl/20 mM Tris pH 7.5/1 mMEDTA/1 mM EGTA/1% Triton X-100/1 protease inhibitor tablet (RocheDiagnostics GmbH Cat. No. 1 836 170) per 10 ml buffer/10 μl/mlphosphatase inhibitor cocktail 1 (Sigma Cat. No. P-2850, 100× Stock), 10μl/ml protease inhibitor 1 (Sigma Cat. No. P-5726, 100× Stock)/10 μl/ml1 M NaF) was added. After 30 minutes on ice the plates were shakenvigourously on a plateshaker for 3 minutes and then centrifuged 10minutes at 2200 rpm (Heraeus Megafuge 10).

The presence of phosphorylated and total CSF-1 receptor in the celllysate was analyzed with Elisa. For detection of the phosphorylatedreceptor the kit from R&D Systems (Cat. No. DYC3268-2) was usedaccording to the instructions of the supplier. For detection of totalCSF-1R 10 μl of the lysate was immobilized on plate by use of thecapture antibody contained in the kit. Thereafter 1:750 dilutedbiotinylated anti CSF-1R antibody BAF329 (R&D Systems) and 1:1000diluted streptavidin-HRP conjugate was added. After 60 minutes plateswere developed with freshly prepared ABTS® solution and the absorbancewas detected. Data were calculated as % of positive control withoutantibody and the ratio value phospho/total receptor expressed. Thenegative control was defined without addition of M-CSF-1. Anti CSF-1RSC-02, clone 2-4A5 (Santa Cruz Biotechnology, US, see also Sherr, C. J.,et al., Cell 41 (1985) 665-676), which inhibits the ligand-receptorinteraction, was used as reference control.

TABLE 2 Calculated IC₅₀ values for the inhibition of CSF-1 receptorphosphorylation IC50 CSF-1R Antibody Phosphorylation [ng/ml]<CSF-1R>7G5.3B6 <11.0 SC-02, clone 2-4A5 412.0

Example 4 Determination of the Affinity of Anti-CSF-1R Antibodies toCSF-1R

Instrument: BIACORE® A100

Chip: CM5 (Biacore BR-1006-68)

Coupling: amine coupling

Buffer: PBS (Biacore BR-1006-72), pH 7.4, 35° C.

For affinity measurements 36 μg/ml anti mouse Fcγ antibodies (from goat,Jackson Immuno Reasearch JIR115-005-071) have been coupled to the chipsurface for capturing the antibodies against CSF-1R. CSF-1R ECD(R&D-Systems 329-MR or in-house subclonedpCMV-presS-HisAvitag-hCSF-1R-ECD were added in various concentrations insolution. Association was measured by an CSF-1R-injection of 1.5 minutesat 35° C.; dissociation was measured by washing the chip surface withbuffer for 10 minutes at 35° C. Anti CSF-IR SC-02, clone 2-4A5 (SantaCruz Biotechnology, US; see also Sherr, C. J., et al., Cell 41 (1985)665-676), which inhibits the ligand-receptor interaction, was used asreference control.

For calculation of kinetic parameters the Langmuir 1:1 model was used.

TABLE 3 Affinity data measured by SPR (BIACORE ® A100) at 35° C.Antibody K_(D) (nM) k_(a) (1/Ms) k_(d) (1/s) t_(1/2) (min)<CSF-1R>7G5.3B6 0.61  8.0E+06  4.9E−03 2.37 SC-02, clone 2-4A5 2.735.09E+05 1.39E−03 8.31

Example 5 Epitope Mapping of Anti-CSF-1R Monoclonal Antibodies Based onCross-Competition by Utilizing SPR

Instrument: BIACORE® A100

Chip: CM5 (Biacore BR-1006-68)

Coupling: amine coupling

Buffer: PBS PBS (Biacore BR-1006-72), pH 7.4, 25° C.

For epitope mapping assays via cross-competition 36 μg/ml anti mouse Fcγantibodies or anti rat Fcγ antibodies (from goat, Jackson ImmunoResearch Cat. No. 115-005-071 and Cat. No. 112-005-071) have beencoupled to sensor chip surface for presentation of the antibody againstCSF-1R. After capture from 5 μg/ml anti-CSF-1R monoclonal antibodiesfree binding capacities of capture antibodies have been blocked with 250μg/ml mouse or rat immunoglobulins (Pierce Cat. No. 31202 and PierceCat. No. 31233), followed by injection of 12.5 μg/ml CSF-1R (R&D-SystemsCat. No. 329-MR) for 2 min Binding of second anti-CSF-1R antibody hasbeen analyzed by injection for 2 min, dissociation was measured bywashing with buffer for 5 minutes. The assay and the measurements wereconducted at 25° C. The specific binding of the second anti-CSF-1Rantibody has been referenced against spot with the same chip setup upbut only without injection of CSF-1R. The cross competition data havebeen calculated in percentage (%) of expected binding response of thesecond anti-CSF-1R antibody. The item “percentage (%) of expectedbinding response” for binding of the second antibody was calculated by“100*relativeResponse(general_stability_early)/rMax”, where rMax iscalculated by “relativeResponse(general_stability_late)*antibodymolecular weight/antigen molecular weight” as described in Biacoreepitope mapping instructions (for BIACORE® A100 instrument).

The minimal binding response was also calculated from the pairs ofidentical antibody 1 and 2. Thereof the obtained maximal value+100%,preferably 50%, was set as threshold for significant binding competition(see table X e.g. for antibody <CSF-1R>7G5.3B6 calculated threshold is3+3=6, preferably 3+1.5=4.5). Thus an “anti-CSF-1R antibody binding tothe same epitope as <CSF-1R>7G5.3B6” has a percentage (%) of expectedbinding response <6, preferably <4.5.

The anti-CSF-1R SC-02, clone 2-4A5 (Santa Cruz Biotechnology, US, seealso Sherr, C. J., et al., Cell 41 (1985) 665-676), which inhibit theligand-receptor interaction, was used as reference control.

TABLE 4 The epitope mapping via cross-competition data of anti CSF-1Rantibodies Antibody 2 Antibody 1 <CSF-1R>7G5.3B6 SC-02, clone 2-4A5<CSF-1R>7G5.3B6 3 36 SC-02, clone 2-4A5 62 −2

The results indicate that the antibodies binding to the same epitope as<CSF-1R>7G5.3B6, bind to another epitope than SC-02, clone 2-4A5.

Example 6 Growth Inhibition of NIH3T3-CSF-1R Recombinant Cells in 3DCulture Under Treatment with Anti-CSF-1R Monoclonal Antibodies(CELLTITER-GLO®-Assay)

NIH 3T3 cells, retrovirally infected with either an expression vectorfor full-length wildtype CSF-1R (SEQ ID No: 15) or mutant CSF-1R L301SY969F (SEQ ID No: 16), were cultured in DMEM high glucose media (PAA,Pasching, Austria) supplemented with 2 mM L-glutamine, 2 mM sodiumpyruvate and non-essential amino acids and 10% fetal bovine serum(Sigma, Taufkirchen, Germany) on poly-HEMA(poly(2-hydroxyethylmethacrylate)) (Polysciences, Warrington, Pa., USA))coated dishes to prevent adherence to the plastic surface. Cells areseeded in medium replacing serum with 5 ng/ml sodium selenite, 10 mg/mltransferrin, 400 μg/ml BSA and 0.05 mM 2-mercaptoethanol. When treatedwith 100 ng/ml huCSF-1 (Biomol, Hamburg, Germany) wtCSF-1R expressingcells form dense spheroids that grow three dimensionally, a propertythat is called anchorage independence. These spheroids resemble closelythe three dimensional architecture and organization of solid tumors insitu. Mutant CSF-1R recombinant cells are able to form spheroidsindependent of the CSF-1 ligand. Spheroid cultures were incubated for 3days in the presence of 10 μg/ml antibody. The CELLTITER-GLO® assay wasused to detect cell viability by measuring the ATP-content of the cells.

TABLE 5 NIH3T Cells NIH3T Cells Antibody expressing % survivalexpressing % survival <CSF-1R>7G5.3B6 0  140   SC-02, clone 2-4A5 62**66*** **average of 15 different experiments, ***average of 6 differentexperiments

Example 7 Growth Inhibition of BeWo Tumor Cells in 3D Culture UnderTreatment with Anti-CSF-1R Monoclonal Antibodies (CELLTITER-GLO® Assay)

BeWo choriocarcinoma cells (ATCC CCL-98) were cultured in F12K media(Sigma, Steinheim, Germany) supplemented with 10% FBS (Sigma) and 2 mML-glutamine. 5×10⁴ cells/well were seeded in 96-well poly-HEMA(poly(2-hydroxyethylmethacrylate)) coated plates containing F12K mediumsupplemented with 0.5% FBS and 5% BSA. Concomitantly, 200 ng/ml huCSF-1and 10 μg/ml of different anti-CSF-1R monoclonal antibodies were addedand incubated for 6 days. The CELLTITER-GLO® assay was used to detectcell viability by measuring the ATP-content of the cells in relativelight units (RLU). When BeWo spheroid cultures were treated withdifferent anti-CSF-1R antibodies (10 μg/ml) inhibition of CSF-1 inducedgrowth was observed. To calculate antibody-mediated inhibition the meanRLU value of unstimulated BeWo cells was subtracted from all samples.Mean RLU value of CSF-1 stimulated cells was set arbitrarily to 100%.Mean RLU values of cells stimulated with CSF-1 and treated withanti-CSF-1R antibodies were calculated in % of CSF-1 stimulated RLUs.The Table 6 shows the calculated data; FIG. 1 depicts mean RLU values.Each mean value was derived from triplicates.

TABLE 6 % inhibition 10 μg/ml Antibody antibody concentration CSF-1 only0 <CSF-1R>7G5.3B6 101 SC-02, clone 2-4A5 40

Example 8 Inhibition of Macrophage Differentiation/Monocyte SurvivalUnder Treatment with Anti-CSF-1R Monoclonal Antibodies (CELLTITER-GLO®Assay)

Monocytes isolated from peripheral blood using the ROSETTESEP™ HumanMonocyte Enrichment Cocktail (StemCell Tech.—Cat. No. 15028). Enrichedmonocyte populations were seeded into 96 well microtiterplates (2.5×10⁴cells/well) in 100 μl RPMI 1640 (Gibco—Cat. No. 31870) supplemented with10 FCS (GIBCO—Cat. No. 011-090014M), 4 mM L-glutamine (GIBCO—Cat. No.25030) and 1× PenStrep (Roche Cat. No. 1 074 440) at 37° C. and 5% CO₂.

When 150 ng/ml huCSF-1 was added to the medium, a clear differentiationinto adherent macrophages could be observed. This differentiation couldbe inhibited by addition of anti-CSF-1R antibodies. Concomitantly, themonocyte survival is affected and could be analyzed byCELLTITER-GLO®(CTG) analysis. From the concentration dependentinhibition of the survival of monocytes by antibody treatment. an IC₅₀was calculated (see Table 7).

TABLE 7 Antibody IC₅₀ [nM] <CSF-1R>7G5.3B6 0.4 SC-02, clone 2-4A5 2.4

The invention claimed is:
 1. An isolated nucleic acid encoding anantibody binding to human macrophage colony-stimulating factor 1receptor (CSF-1R), or an antibody fragment thereof, wherein theantibody, or antibody fragment thereof, comprises: a heavy chainvariable domain comprising a CDR3 region of SEQ ID NO: 1, a CDR2 regionof SEQ ID NO: 2, and a CDR1 region of SEQ ID NO:3; and a light chainvariable domain comprising a CDR3 region of SEQ ID NO: 4, a CDR2 regionof SEQ ID NO:5, and a CDR1 region of SEQ ID NO:6.
 2. The isolatednucleic acid of claim 1, wherein the antibody, or antibody fragmentthereof, comprises: a heavy chain variable domain comprising the aminoacid sequence of SEQ ID NO: 7, and a light chain variable domaincomprising the amino acid sequence of SEQ ID NO:8.
 3. The isolatednucleic acid of claim 1, wherein the antibody, or antibody fragmentthereof, is of human IgG4 subclass or is of human IgG1 subclass.
 4. Theisolated nucleic acid of claim 1, wherein the antibody, or antibodyfragment thereof, is a CDR grafted, humanized, T cell epitope depleted,chimeric, single chain, or multispecific antibody.
 5. The isolatednucleic acid of claim 1, wherein the antibody, or antibody fragmentthereof, is capable of binding human CSF-1R with a Kd value of 1 nM orlower.
 6. The isolated nucleic acid of claim 1, wherein the antibody, orantibody fragment thereof, inhibits human CSF-1 binding to CSF-1R withan IC50 value of 25 ng/ml or lower.
 7. The isolated nucleic acid ofclaim 1, wherein the antibody, or antibody fragment thereof, is amonoclonal antibody.
 8. An expression vector comprising the nucleic acidof claim
 1. 9. An isolated prokaryotic or eukaryotic host cellcomprising the vector of claim
 8. 10. A method for the production of anantibody binding to human CSF-1R, or antibody fragment thereof, themethod comprising expressing the expression vector of claim 8 in aprokaryotic or eukaryotic host cell and recovering said antibody.
 11. Anisolated nucleic acid encoding an antibody binding to human CSF-1R, oran antibody fragment thereof, wherein the antibody is the depositedantibody DSM ACC2921.